1.

A lab assistant prepared a solution by adding a calculated quantity of HCl gas 25^@C to get a solution with [H_3O^+]=4 times 10^-5M. Is the solution neutral (or) acidic (or) basic.

Answer»

SOLUTION :`[H_3O^+]=4 TIMES 10^-5 M`
`pH=-log_10[H_3O^+]`
`pH=-log_10[4 times 10^-5]`
`pH=-log_10[4]-log_10[10^-5]`
`pH=-0.6020-(-5)=-0.6020+5`
`pH=4.398`


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