1.

Assuming complete dissociation, which of the following aqueous solutions will have the same pH value

Answer»

100 ML of 0.01 M HCl
100 ml of 0.01 M `H_(2)SO_(4)`
50 ml of 0.01 M HCl
Mixture of 50 ml of 0.02 M `H_(2)SO_(4)` and 50 ml of 0.02 M NaOH

Solution :M. eq. of 0.01 M HCL `= (0.01 XX 100)/(1000) = 1 xx 10^(-3)`
M. eq. of 0.02 M `H_(2)SO_(4) = (0.04 xx 50)/(1000) = 2 xx 10^(-3)`
M. eq. of 0.02 M NaOH `= (0.02 xx 50)/(1000) = 1 xx 10^(-3)`
Left `[H^(+)] = 2 xx 10^(-3) - 1 xx 10^(-3) = 1 xx 10^(-3)`
pH = 3


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