![carastudies9931](/avatars/1457.jpg)
carastudies9931
11.05.2021 •
Chemistry
If the acid dissociation constant, Ka, for an acid HA is 8 x 104 at 25°C, what percent of the acid is dissociated
in a 0.50 M solution of HA at 25°C?
A
08%
Solved
Show answers
More tips
- F Food and Cooking Ginger: A Universal Ingredient for Various Dishes...
- A Auto and Moto Which alarm system to choose?...
- C Computers and Internet Porn Banner: What It Is and How to Get Rid Of It?...
- F Food and Cooking How many stages of coffee roasting are there?...
- F Food and Cooking From Latte to Espresso: Which Coffee Drink is the Most Popular on Earth?...
- F Food and Cooking Experts Name Top 5 Healthiest Teas...
- C Computers and Internet Google Search Tips and Tricks: Everything You Need to Know...
- H Health and Medicine Discover the Hidden Principles and Real Results of the Japanese Diet...
- H Health and Medicine Liver Cleansing - Rejuvenation for the Body?...
- S Style and Beauty Is Photoepilation the Solution to Unwanted Hair Forever?...
Answers on questions: Chemistry
- C Chemistry How are the carbon, nitrogen, and oxygen cycles similar...
- C Chemistry Complete the balanced equation: cu(no3)2 + na2co3 ?...
- C Chemistry Convection transforms thermal (heat) energy into what type of energy?...
- C Chemistry Reactant a contains 85.1 j of chemical energy. reactant b contains 87.9 j of chemical energy. product c contains 38.7 j of chemical energy. if the reaction absorbs...
- C Chemistry The density of a liquid is 1.25 g/mL. What is the mass of 75.0 mL of the sample?...
- C Chemistry Completa la siguiente tabla...
- M Mathematics 3. 0.7kg : 800g I’m pretty bad with ratios lol...
- M Mathematics How do i find a fraction of a number...
- S Spanish I need help with this one. Please help...
- M Mathematics Ramon s hockey camp was four and a half hours long. If the camp ended at 11:45 a.m., what time did it start?...
Ответ:
Percent dissociated = 3.92%
Explanation:
The equilibrium of the weak acid, HA, is:
HA ⇄ H⁺ + A⁻
Where Ka = 8x10⁻⁴ is: [H⁺] [A⁻] / [HA]
As both H⁺ and A⁻ comes from the same equilibrium we can write the concentrations of the species as follows:
[H⁺] = X
[A⁻] = X
[HA] = 0.50M - X
Where X is reaction coordinate
Replacing:
8x10⁻⁴ = X² / 0.50-X
4x10⁻⁴ - 8x10⁻⁴X - X² = 0
Solving for X:
X = -0.02M. False solution. There is no negative concentrations
X = 0.0196M. Right solution.
Replacing:
[A⁻] = 0.0196M
Percent of the acid that is dissociated is:
[A⁻] / [HA]₀ * 100
[HA]₀ is its initial concentration = 0.50M
0.0196M / 0.50M * 100
Percent dissociated = 3.92%Ответ:
Ions are formed when atoms lose or gain electrons in order to fulfill the octet rule and have full outer valence electron shells. When they lose electrons
Explanation: