Chemistry-
General
Easy

Question

When a salt reacts with water to form acidic or basic solution, the process is called hydrolysis. The pH of salt solution can be calculated using the following relations
p H equals fraction numerator 1 over denominator 2 end fraction open square brackets p K subscript w end subscript plus p K subscript a end subscript plus l o g invisible function application C close square brackets
(for salt of weak acid and strong base.)
p H equals fraction numerator 1 over denominator 2 end fraction open square brackets p K subscript w end subscript minus p K subscript b end subscript minus l o g invisible function application C close square brackets
(for salt of weak base and strong acid.)
p H equals fraction numerator 1 over denominator 2 end fraction open square brackets p K subscript w end subscript plus p K subscript a end subscript minus p K subscript b end subscript close square brackets
(for salt of weak acid and weak base.)
where, 'C' represents the concentration of salt.
When a weak acid or a weak base is not completely neutralized by strong base or strong acid respectively, then formation of buffer takes place. The pH of buffer solution can be calculated using the following relation
p H equals p K subscript a end subscript plus log invisible function application fraction numerator open square brackets blank S a l t blank close square brackets over denominator open square brackets blank A c i d blank close square brackets end fraction semicolon p O H equals p K subscript b end subscript plus log invisible function application fraction numerator open square brackets blank S a l t blank close square brackets over denominator open square brackets blank B a s e blank close square brackets end fraction
p K subscript a end subscript equals 4.7447 comma p K subscript b end subscript equals 4.7447 comma p K subscript w end subscript equals 14
When 50 mL of 0.1 M NaOH is added to 50 mL of 0.05 M C H subscript 3 end subscript C O O H solution. The pH of the solution is:

  1. 1.6021    
  2. 12.3979    
  3. 4.7447    
  4. 8.7218    

The correct answer is: 12.3979

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