Acid base chemistry part ii
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Acid/Base Chemistry Part II. CHEM 2124 – General Chemistry II Alfred State College Professor Bensley. Learning Objectives. Write the chemical equation for a weak acid undergoing acid ionization in aqueous solution. Define acid dissociation constant. Determine K a from a solution pH.

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Acid/Base Chemistry Part II

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Acid base chemistry part ii

Acid/Base Chemistry Part II

CHEM 2124 – General Chemistry II

Alfred State College

Professor Bensley


Learning objectives

Learning Objectives

  • Write the chemical equation for a weak acid undergoing acid ionization in aqueous solution.

  • Define acid dissociation constant.

  • Determine Ka from a solution pH.

  • Calculate concentrations of species in a weak acid solution using Ka.

  • Write the hydrolysis reaction of an ion to form an acidic solution.


Learning objectives1

Learning Objectives

  • Recognize common acid-base reactions.

  • Predict whether a salt solution is acidic, basic, or neutral.

  • Calculate concentrations of acid or base solutions through titrations.

  • Define buffer.


Learning objectives2

Learning Objectives

  • Describe the pH change of a buffer solution with the addition of an acid or a base.

  • Calculate the pH of a buffer from given volumes of solution.

  • Calculate the pH of a buffer when a strong acid or a strong base is added.

  • Learn and apply the Henderson-Hasselbalch equation.


Acid base chemistry part ii1

Acid/Base Chemistry – Part II

A. Equilibrium and Acid Dissociation Constants


B the relationship between h 3 o ph and k a

Acid/Base Chemistry – Part II

B. The relationship between [H3O+], pH, and Ka

[H3O+] = √KaC0

pH = ½ pKa – ½ log C0


Acid base chemistry part ii2

Acid/Base Chemistry – Part II

C. Common Acid/Base Reactions

1. Neutralization reaction

2. Net Ionic Reaction of Neutralization reactions:

3. Bicarbonate Base reactions

D. The Acidity and Basicity of Salt Solutions

NaHCO3

NaCl

Na+

from NaOH

strong base

HCO3−

from H2CO3

weak acid

Na+

from NaOH

strong base

Cl−

from HCl

strong acid


Acid base chemistry part ii

NH4Cl

NH4+

from NH3

weak base

Cl−

from HCl

strong acid


E buffers

E. Buffers

Acid/Base Chemistry – Part II

A buffer is a solution whose pH changes very little

when acid or base is added.


Acid base chemistry part ii3

Acid/Base Chemistry – Part II

F. Calculating the pH of a Buffer

Henderson-Hasselbalch Equation

  • pH = pKa + log ([A-]/[HA])

  • pH = pKa + log Cs – log Ca


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