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Solution


Q.

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed          [2015]
1 2.0  
2 7.0  
3 1.04  
4 12.65  

Ans.

(4)

One mole of NaOH is completely neutralised by one mole of HCl.

Hence, 0.01 mole of NaOH will be completely neutralised by 0.01 mole of HCl.

⇒NaOH left unneutralised = 0.1 - 0.01 = 0.09 mol

As equal volumes of two solutions are mixed,

[OH]-=0.092=0.045 M

⇒pOH=-log(0.045)=1.35  ∴  pH=14-1.35=12.65