1.

Calculate the pH of 0.001 molar solution of HCI.

Answer»

Solution :HCI is a strong acid and is completely dissociated in its solutions according to the process:
`HCl_(aq)toH_(aq)^(+)+Cl_(aq)^(-)`
From this process it is clear that one mole of HCI would give on mole of `H^(+)` ions.
Therefor ,the concentration of `H^(+)` ions would be equla to that of HCl ,i.e., 0.001 molar or `1.0xx10^(10^(-3))` MOL `LITRE^(-1)`
THUS `[H^(+)]=log_(10)10^(-3)`
`=-(-3xxlof_(10))=-(3xx1)=3`
Thus ,pH=3


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