Answer
is: the
percent ionizationof formic acid is 1,82%.
Chemical reaction: HCOOH(aq) ⇄ H⁺(aq)
+ HCOO⁻(aq).
pKa(HCOOH) = 3,77.
Ka(HCOOH) = 1,7·10⁻⁴.
c(HCOOH) = 0,5 M.
[H⁺]
= [HCOO⁻] = x; equilibrium
concentration.
[HA] = 0,1 M - x.
Ka = [H⁺] · [HCOO⁻] / [HCOOH].
0,00017 = x² / 0,5 M - x.
Solve quadratic equation: x = 0,0091 M.
α = 0,0091 M ÷ 0,5 M · 100% = 1,82%.
Answer : 1.91 %
Explanation : The steps to solve this problem are explained below;
1. HCOOH ⇄ [tex]HCOO^{-} + H^{+} [/tex]
Here Ka =([tex] [HCOO^{-}]_{eq} X [H^{+}]_{eq} [/tex] )/ [tex][HCOOH]_{eq}[/tex]
As the equilibrium concentration of [tex] H^{+} [/tex] will be the pH of the solution.
∴ [tex] [H^{+}]_{eq}[/tex] = [tex]10^{(-2.02)} = 9.55 x [tex] 10^{-3} [/tex] M
2. The initial concentration of HCOOH. When it loses x moles from it as the acid undergoes dissociation to form [tex]HCOO^{-}[/tex] and [tex]H^{+}[/tex].
3. The moles present will be as
[HCOOH] (M) [tex] [H^{+}] [/tex](M) [tex][HCOO^{-}] [/tex](M)
Initial 0.50 0.00 0.00
After Change -x +x +x
Equilibrium ( 0.50 -x) x x
∴ Ka = (x) x (x) / (0.50 - x)
4. Assuming that all of the [tex] H^{+}[/tex] comes from the acid, and none from water.
As [tex] [H^{+}]_{eq}[/tex] = 9.55 x[tex] 10^{-3}[/tex] which is much higher than the 1.0 x[tex] 10^{-7 } [/tex] M [tex[H^{+}[/tex] from water.
Also, the concentration of HCOOH will change very little, from 0.50 to 0.50 - 9.55 x [tex] 10^{-3}[/tex].
The change in concentration can be ignored if it is less than 5% of the original concentration.
∴ 0.50 M x 5% = 0.025, so the change in [HCOOH] in this problem can be ignored.
Now, Ka = (x)(x)/0.50 = (9.55 x [tex] 10^{-3})^{2}[/tex] /0.50= 1.82 x [tex] 10^{-4}[/tex]
Now, calculating the percent ionization for this problem.
which will represent the relative number of acid molecules which dissociate. It is calculated as :
[tex] [H^{+}]_{eq} [/tex] x 100 /[tex] [HCOOH]_{i}[/tex]
∴ percent ionization = {(9.55 x [tex] 10^{-3})[/tex]/ (0.50)}x 100 = 1.91 %
This value of 1.91 % indicates that very little of this acid dissociates (ionizes) under these conditions.
For strong acids and bases, the percent ionization is 100%.
Why do some molecules begin sticking together when you add in more molecules?
Some molecules begin sticking together when you add in more molecules because like attracts like and opposites repel.
What is molecules?A collection of two and more substances joined through chemical bonds is still referred to as a molecule.
What is like attracts like?like attracts like means It is repulsive when two items with identical charges interact. That is fascinating to watch how two objects with opposing charges interact.
Some molecules begin sticking together when you add in more molecules because like attracts like and opposites repel
To know more about like attracts like and molecules
https://brainly.com/question/19922822
#SPJ2
Which planet has a distinctive red spot? A. Mercury B. Venus C. Jupiter D. Mars
Determine the percent composition by mass of the element carbon in the acetamide compound
How many moles of water are produced from 12.8 moles of oxygen
Which of the following is a characteristic of most non-metals and is not a characteristic of most metals?
A. Replaces the hydrogen in acids to form stable compounds
B. Is malleable and ductile
C. Has a negative charge when a current is run through its solution
D. Can conduct electricity and heat
Answer: Option (C) is the correct answer.
Explanation:
Non-metals are the substances which gain electrons in order to gain stability and hence they form anions.
Some properties of non-metals are as follows.
Non-metals are bad conductors of heat and electricity. They are brittle in nature.Non-metals have non-shiny surface.But non-metals when gain an electron they they acquire a negative charge. Hence, when non-metal is present in ionic form in a solution then it is able to conduct electricity.
Thus, we can conclude that has a negative charge when a current is run through its solution is a characteristic of most non-metals and is not a characteristic of most metals.
When the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of Ca(OH)2? Ca(OH)2 + H3PO3 yields H2O + Ca3(PO3)2
Ans: Lowest coefficient in front of Ca(OH)2 is 3
Given equation:
Ca(OH)2 + H3PO3 → Ca3(PO3)2 + H2O
Reactants: Products:
Ca = 1 Ca = 3
O = 5 O = 7
H = 5 H = 2
P = 1 P = 2
Balanced equation:
3Ca(OH)2 + 2H3PO3 → Ca3(PO3)2 + 6H2O
Neon has 10 electrons and krypton has 18 electrons which element do you think has a greater chance of forming a momentary dipole and why
Neon (Ne) has a greater chance of forming a momentary dipole due to its completely filled outer electron shell.
Explanation:The element with a greater chance of forming a momentary dipole is neon (Ne). Neon has a completely filled outer electron shell, which makes it inert and less likely to form chemical bonds. This means that when neon interacts with other elements, it can induce temporary dipole moments in the other atoms or molecules, creating momentary attractions between them.
Learn more about Forming a Momentary Dipole here:https://brainly.com/question/30724838
#SPJ2
PLEASE HELP MEDALS WILL BE AWARDED!!!
To prevent a condition called the “bends”, deep sea divers breathe a mixture containing, in mole percent, 10.0% O2, 10.0% N2 , and 80.0% He.
a. Calculate the molar mass of this mixture.
b. What is the ratio of the density of this gas to that of pure Oxygen?,
Consider the chemical equilibrium of the following reaction
CH3COOH mc015-1.jpg CH3COO– (aq) + H+(aq)
What will happen to the chemical equilibrium of the solution if CH3COONa is added?
The equilibrium will shifts to the right.
The equilibrium will shifts to the left.
The equilibrium will be unaffected.
The equilibrium will be lost.,
Answer:
The Equilibrium will shift to the left.
Explanation:
The reaction at equilibrium is as follow,
CH₃COOH ↔ CH3COO⁻ + H⁺
According to Le Chatelier's Principle," When a system (reaction) at equilibrium is subjected to any stress (like change in Concentration, Pressure, Temperature e.t.c) the system (reaction) tends to adjust itself in such a way so as to minimize the effect of that change".
Hence, in above reaction when Sodium Acetate (source of CH₃COO⁻) is added the equilibrium will shift in left side and will decrease the concentration of CH₃COO⁻ions.
Final answer:
The addition of CH₃COONa, which contributes more acetate ions, will result in a leftward shift of the chemical equilibrium of the reaction CH₃COOH ⇌ CH₃COO⁻ (aq) + H⁺(aq), as predicted by Le Chatelier's principle.
Explanation:
When CH₃COONa is added to the solution, the chemical equilibrium of the reaction CH₃COOH ⇌ CH₃COO− (aq) + H⁺(aq) will shift. This is because CH₃COONa disassociates in water to form sodium ions (Na⁺) and acetate ions (CH₃COO⁻). By Le Chatelier's principle, adding more of a product (in this case, CH₃COO⁻) will shift the equilibrium to the left, towards the reactants, to counteract the change. This results in a decrease in the H+ concentration and is known as the common ion effect.
The equilibrium will therefore shift toward the formation of CH₃COOH, causing the concentration of CH₃COO⁻ and H⁺ to be reduced, which is in line with Le Chatelier's principle of equilibrium adjustment.
#1: When you heat an air-filled balloon, what happens inside with regard to the movement of air molecules?
A. The collisions of air molecules against the wall of the balloon are weaker.
B. The collisions of air molecules against the wall of the balloon are stronger.
C. The collisions of air molecules against the wall of the balloon do not change.
**my answer: B
is that right?? @aaronq :)
Suppose there are two known compounds containing generic X and Y. You have a 1.00g sample of each compound. One sample contains .34g of X and the other contains .44g of X. Identify plausible sets of formulas for the two compounds
If a doughnut contains 1.8 moles of sugar (C6H12O6), how many sugar molecules are in a box of one dozen doughnuts?
Answer:
130.1 x 10²³ molecules of sugar
Explanation:
One dozen = 12 donuts
1 doughnut = 1.8 moles of sugar
12 doughnut = (1.8 x 12) moles of sugar = 21.6 moles of sugar
1 mole of any substance contains Avogadro’s number (6.023 x 10²³) of molecules.
1 mole of sugar = 6.023 x 10²³ molecules of sugar
21.6 moles of sugar = (6.023 x 10²³ x 21.6) molecules of sugar
= 130.1 x 10²³ molecules of sugar
Answer:
A.) 130.032 x 10^23
Explanation:
I got it correct on founders edtell
A chemical bond formed when two atoms share six electrons is a ________ bond; it is best described as ________. a chemical bond formed when two atoms share six electrons is a ________ bond; it is best described as ________.
Explanation:
When there occurs sharing of electrons between two different atoms then bond formed between them is known as a covalent bond.
When only one electron is shared then a single covalent bond is formed.
When only two electrons are shared then a double covalent bond is formed.
When three electrons are shared then a triple covalent bond is formed.
Thus, we can conclude that a chemical bond formed when two atoms share six electrons is a triple bond; it is best described as a covalent bond.
How to calculate C02 molecules in 5.24x10 -2?
Which of the following is the correct name for the compound mgbr2? magnesium bromate magnesium bromide magnesium dibromide magnesium (1) bromide
Final answer:
The correct IUPAC name for MgBr2 is 'magnesium bromide', where 'magnesium' denotes the metal cation and 'bromide' denotes the nonmetal anion with its ending changed to 'ide'.
Explanation:
The correct name for the compound MgBr2 is magnesium bromide. According to the International Union of Pure and Applied Chemistry (IUPAC) system of nomenclature, binary ionic compounds (compounds consisting of a metal and a nonmetal) are named by writing the name of the metal (the cation) followed by the name of the nonmetal (the anion) with its ending changed to 'ide'. In our case, 'Mg' stands for magnesium, and 'Br' stands for bromine; when combined in the compound MgBr2, the bromine becomes bromide. The prefix 'di' is not used in this name because the stoichiometry (the ratio of Mg to Br) is inferred by the charges on the ions; magnesium has a +2 charge and bromine has a -1 charge, so two bromine atoms are required to balance the charge of one magnesium atom.
Fossils provide evidence that
1) Life on earth millions of years ago was more complex than life is today
2) The changes that will occur in species in the future are easy to predict
3)Many species of organisms that lived long ago are now extinct
4)Most species of organisms that lived long ago are exactly same today
Part A (7 points): How many grams of iron (Fe) will be produced if you start with 3.65 liters of carbon monoxide gas (CO) at STP?
Part B (3 points): Jacob performed the above experiment in his chemistry class, and collected 4.23 grams of iron. What is the percent yield?
Fe2O3 + 3 CO --> 2 Fe + 3 CO2
The given balanced chemical equation is,
[tex] Fe_{2}O_{3} + 3CO -->2 Fe (s) + 3CO_{2}(g) [/tex]
Part A:
Converting 3.65 L CO to moles:
[tex] 3.65 L * \frac{1 mol}{22.4 L} = 0.163 mol CO [/tex]
Moles of Fe that will be produced from 0.163 mol CO:
[tex] 0.163 mol CO * \frac{2 mol Fe}{3 mol CO} = 0.1086 mol Fe [/tex]
Mass of Fe = [tex] 0.1086 mol Fe * \frac{55.85 g}{1 mol} = 6.07 g Fe [/tex]
Part B: Actual yield of Fe = 4.23 g Fe.
Theoretical yield = 6.07 g Fe
Percentage yield = [tex] \frac{Actual yield (g)}{Theoretical yield (g)}*100 [/tex]
=69.7 %
Nonpolar molecules that cluster away from water molecules are called __________ molecules.
Hydrophobic molecules are nonpolar molecules that cluster away from water molecules. They have nonpolar covalent bonds and examples include oil, fats, and waxes.
Explanation:Nonpolar molecules that cluster away from water molecules are called hydrophobic molecules. Hydrophobic molecules typically have nonpolar covalent bonds, which means the electronegativity difference between the bonded atoms is minimal. This leads to an absence of partial charges on the atoms, resulting in overall nonpolarity. Examples of hydrophobic molecules include oil, fats, and waxes.
Learn more about Hydrophobic molecules here:https://brainly.com/question/31824394
#SPJ12
(Fe(s)+CuSO4(aq)--FeSO4(aq)+Cu(s) this chemical equation represents a ___________ reaction
Answer : This chemical equation represents a single replacement reaction.
Explanation :
Single replacement reaction : It is defined as the reaction in which the most reactive metal displace the least reactive metal form its solution.
The given balanced chemical reaction is:
[tex]Fe(s)+CuSO_4(aq)\rightarrow FeSO_4(aq)+Cu(s)[/tex]
The given chemical reaction is a single replacement reaction because in this reaction, iron is most reactive metal than the copper. So, iron can displace the copper metal form its solution and it forms iron (II) sulfate and copper as a product.
Hence, the chemical equation represents a single replacement reaction.
Jasmine is a cook, and she wants to buy new equipment. She is presented with dishes made of copper, clay, plastic, and glass. She selects the copper pot because she does most of her cooking on the stove. Which explains why she most likely chose copper?
What happens to the concentration of the reactants and products during the course of a forward chemical reaction
In an experiment, a plant was given __________ containing a heavy isotype of oxygen (18o), and the heavy oxygen atoms were used to make sugar. view available hint(s) in an experiment, a plant was given __________ containing a heavy isotype of oxygen (18o), and the heavy oxygen atoms were used to make sugar. water carbon dioxide chlorophyll oxygen gas
When 10.0 mL of the 0.50 M solution is diluted to 100 mL as shown, what is the new concentration?,
In this problem, we are asked to find the new concentration.
So, we use the dilution equation;
M1V1 = M2V2
Where M1 = concentration in molarity (moles/Liters) of the concentrated solution,
V2 =volume of the concentrated solution,
M2 =concentration in molarity of the dilute solution, and
V2 = volume of the dilute solution.
Before substituting the formula, convert the given mL to L since the unit for molarity is (moles/Liter).
Use the conversion factor (1000 mL = 1 L), so:
10.0 mL = 0.01 L
100 mL= 0.1 L
Now, we substitute the given (in liters) to the formula.
(0.50 M) (0.01 L) = M2(0.1 L)
M2 = [(0.50 M) (0.01 L)] / 0.1 L
M2 = 0.05 M
Answer: 0.050
Explanation:
When ammonium carbonate is heated, water, ammonia, and carbon dioxide are produced. what type of chemical reaction is occurring? write formulas for the reaction products?
Final answer:
Ammonium carbonate decomposes when heated, resulting in water, ammonia, and carbon dioxide. The balanced chemical equation for this reaction is (NH4)2CO3(s) → 2 NH3(g) + CO2(g) + H2O(l). This is an example of a decomposition reaction.
Explanation:
When ammonium carbonate is heated, a decomposition reaction occurs, resulting in the formation of water (H2O), ammonia (NH3), and carbon dioxide (CO2). The balanced chemical equation for this reaction is:
(NH4)2CO3(s) → 2 NH3(g) + CO2(g) + H2O(l)
The formulas for the reaction products are ammonia (NH3), carbon dioxide (CO2), and water (H2O). This chemical equation shows that for each mole of ammonium carbonate heated, two moles of ammonia, one mole of carbon dioxide, and one mole of water are produced.
A reaction has an equilibrium constant of 6.5×103 at 298 K. At 764K , the equilibrium constant is 0.44.
Find ΔHorxn for the reaction.,
Using the van't Hoff equation and the provided equilibrium constants at two different temperatures, the enthalpy change (ΔHrxn) of the reaction can be calculated.
Explanation:The student wants to find the change in the heat content, or enthalpy change (ΔHrxn), of a reaction given the equilibrium constants at different temperatures. This can be done through the van't Hoff equation, which relates the equilibrium constant (K) to temperature (T) and enthalpy change (ΔHrxn). Using the provided equilibrium constants at 298 K and 764 K, as well as the constants 55.7 x 103J/mol and 8.314 J/mol K, we can set up and solve the van't Hoff equation to calculate ΔHrxn.
The van't Hoff equation is ln(K2/K1) = (-ΔHrxn/R)(1/T1 - 1/T2), where R is the ideal gas constant (8.314 J/mol K). By rearranging for ΔHrxn, we can input the given values for K1, K2, T1, and T2 to determine the enthalpy change for the reaction.
Write a balanced chemical equation depicting the formation of one mole of h2o2(g) from its elements in their standard states. express your answer as a chemical equation. identify all of the phases in your answer.
A chemical that will ignite spontaneously in air at a temperature of 130 degree fahrenheit (54.4 degree celsius) or below is identified by the term _____.
what is the molality of a 10.5% by mass glucose (C6H12O6) the density of the solution is 1.03 g/ml. i got up to m = 0.058281527 mol/ kg... please help !!!!,
What type mirror is this?
concave
plane
convex
parabolic
If 3.0×105 j of heat are added to the ice, what is the final temperature of the system?