EBK EXPLORING CHEMICAL ANALYSIS
EBK EXPLORING CHEMICAL ANALYSIS
5th Edition
ISBN: 9781319416942
Author: Harris
Publisher: VST
Question
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Chapter 9, Problem 9.22P

(a)

Interpretation Introduction

Interpretation:

Value of p and q for a buffer with pH equals to 6.200 has to be calculated.

Concept Introduction:

The equation for buffer is described by Henderson-Hasselbach equation and it is a rearranged form of equilibrium constant, Ka. It relates pH of buffer solution and pKa value. It also helps to find equilibrium pH in acid-base reactions. Consider an equation of dissociation of acid as follows:

  HAH++A

Formula to calculate pH is as follows:

  pH=pKa+log([A][HA])

Here,

pKa is acid dissociation constant of weak acid HA.

[A] is concentration of conjugate base A

[HA] is concentration of acid HA.

(b)

Interpretation Introduction

Interpretation:

Change in pH if 0.010 mol of H+ is added to a buffer has to be calculated.

Concept Introduction:

Refer to part (a).

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