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Q.

20 ml of 0.4 M H2SO4 and 80 ml of 0.2 M NaOH are mixed. Then the pH of the resulting solution is

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a

11.903

b

7

c

12.903

d

1.097

answer is A.

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Detailed Solution

On mixing, the following reaction take place

      H2SO4 + 2NaOH \large \rightarrowNa2SO4+2H2O

Milli

moles

= 20 x 0.4   80 x 0.2  
  = 8   16  

Since there is no limiting reagent, acid and base will be completely neutralised.

PH of a neutral salt (Na2SO4) solution is 7.

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