1.

0.1 MHCl and 0.1 M H_(2)SO_(4), each of volume 2 ml are mixed and the volume is made up to 6 ml by adding 2 ml of 0.01 N NaCl solution. The pH of the resulting mixture is

Answer»

`1.17`
`1.0`
`0.3`
log 2 - log 3

Solution :2 MLOF 0.1 M HCl =0.2 MILLIMOLE of HCl
= 0.2 millimole of `H^(+)` ion
2 ml of 0.1 M `H_(2)SO_(4)= 0 .2` millimole of `H_(2)SO_(4)`
= 0.4 millimole of `H^(+)` ion
Total `H^(+)` ions = 0.6 millimole
Total volume = 6 ml
`:. [H^(+)]=(0.6)/(6)M=0.1 M =10^(-1)M:. pH = 1`.


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