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Calculate the pH of 0.001M HCl solution ...

Calculate the pH of 0.001M HCl solution
`HCl_(0.001M) leftrightarrow^(H_2O)H_3O_(0.001M)^(+)+Cl_(0.001M)^(-)`

Text Solution

Verified by Experts

`H_3O^+` from the auto ionisation of `H_2O(10^-7M)` is negligible when compared from `10^-3 M HCl`
Hence `[H_3O^+]=0.001 mol dm^-3`
`pH=-log_10[H_3O^+]`
`=-log_(10)(0.001)`
`=-log_10(10^-3)=3`
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