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PURDUE / Chemical Engineering / CHE 11600 / In chemistry, what is the definition of equivalence?

In chemistry, what is the definition of equivalence?

In chemistry, what is the definition of equivalence?

Description

School: Purdue University
Department: Chemical Engineering
Course: General Chemistry II
Professor: N/a
Term: Fall 2016
Tags: General Chemistry
Cost: 50
Name: CHM 116 Exam III Study Guide
Description: Acids, bases, buffers, titrations, and titration curves
Uploaded: 04/02/2017
2 Pages 57 Views 5 Unlocks
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Exam III


In chemistry, what is the definition of equivalence?



Buffers: mixture of a weak acid and its conjugate base or of a weak base and its conjugate acid that maintains a constant pH upon dilution or addition of small amounts of acid or base

Buffer capacity:

Buffer solutions have a limited capacity to keep the pH relatively constant.  The buffering will  be overcome if so much acid or base is added that the ratio of the concentration of the weak  acid or base and its salt changes too much

HA + H2O -> H3O+ + A-                            A-+ H2O -> AH + OH Don't forget about the age old question of What is the bystander effect in psychology?

Ka= [H3O+][A-]/[HA] Kb= [HA][OH-]/[A-]


What is the hydrochloric acid?



pKa= pH – log([A-]/[HA]) where HA is the weak acid and A is the conjugate base pKb= pOH – log([BH+]/[B]) where B is the weak base and BH+ is the conjugate acid

[H3O+] = 10-pH       pH = -log[H3O+]

[OH-] = 10-pOH       pOH = -log[OH-] If you want to learn more check out What is balint's syndrome?

pH + pOH = 14

Ka = 10-pKa            pKa = -log[Ka]


What is the strontium hydroxide?



Kb = 10-pKb    pKb = -log[Kb]

Kb x Ka = Kw

Kw = 10-14 

Kw = [H3O+]water[OH-]water

Acid-Base Titration Curve: A plot of the pH of a solution of acid (or base) versus the volume of  base (or acid) added to the solution.

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At the half equivalence point, pH = pKa

At the equivalence point, the number of moles of added OH– equals the number of moles of  H3O+ originally present or vice versa. If you want to learn more check out What can an aneurysm do to the human body?
Don't forget about the age old question of What is the public goods dilemma?

Useful items to MEMORIZE for Exam III  

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