
Concept explainers
Interpretation:
The pH of the solution formed by mixing the given solutions needs to be determined.
Concept introduction:
The pH of a solution may be stated as it is negative logarithm of concentration of H+ ion. Mathematically it can be written as:

Answer to Problem 188CP
The pH of solution is 7.46.
Explanation of Solution
Number of moles of H2SO4 in 50.0 mL of 0.100 M H2SO4 is calculated as below −
So, 50.0 mL of 0.100 M H2SO4 contains (0.005 mol ) of H2SO4 .
(II) Number of moles of HOCl in 30.0 mL of 0.100 M HOCl is calculated as below −
So, 30.0 mL of 0.100 M HOCl contains (0.003 mol ) of HOCl .
(III) Number of moles of NaOH in 25.0 mL of 0.200 M NaOH is calculated as below −
So, 25.0 mL of 0.200 M NaOH contains ( 0.005 mol ) of NaOH .
(IV) Number of moles of Ba(OH)2 in 25.0 mL of 0.100 M Ba(OH)2 is calculated as below -
(V ) Number of moles of KOH in 10.0 mL of 0.150 M KOH is calculated as below −
So, 10.0 mL of 0.150 M KOH contains (0.0015 mol ) of KOH .
Now,
Left moles of OH- = 0.0115 -0.01=0.0015mol
HOCl | OH- | OCl- | H3O+ | |
I | 0.003 | 0.0015 | ||
C | -0.0015 | -0.0015 | 0.0015 | 0.0015 |
E | 0.0015 | 0 | 0.0015 | 0.0015 |
Thus, the pH of solution is 7.46.
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Chapter 8 Solutions
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