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What will be the resultant pH when 200 m...

What will be the resultant pH when 200 mL of an aqueous solution of HCl (pH =2.0) is mixed with 300 mL of an aqueous solution of NaOH (pH =12.0) ?

Text Solution

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`pH of HCl=2" "therefore [HCl]=10^(-2)M`
`pH of NaOH=12" "therefore [NaOH]=10^(-2)M`
`HCl+NaOH to NaCl+H_(2)O`
Meq. Before reaction `200 xx 10^(-2) 300 x 10^(-2)" 0 0"`
Meq. After reaction `"=2 =3 2 2"`
`therefore [OH^(-)]" left from NaOH "=1/500=2 xx 10^(-3)M`
`therefore pOH =-log OH^(-)=-log 2 xx 10^(-3)`
`therefore pOH=2.6989`
`pH=11.3010`
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