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`K_(sp) ` for `Ca(OH)_(2)` is `5.5xx10^(-6)`. What is the maximum pH that can be attained in a sewage tank treated with slaked lime ?
A. `9.35`
B. `10.35`
C. `11.35`
D. `12.35`

1 Answer

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Best answer
Correct Answer - C
`Ca(OH)_(2)hArrCa^(2+) + 2 OH^(-)`
`K_(sp)=[Ca^(2+)][OH^(-)]^(2)=5.5xx10^(-6)` (Given)
`:.s(2s)^(2)=5.5xx10^(-6)`
or `4s^(3)=5.5xx10^(-6) ` or `s^(3)=1.375xx10^(-6)`
`:. S=1.11xx10^(-2)M`
`:. [OH^(-)]=2s=2.22xx10^(-2)M`
`:.pOH=-log(2.22xx10^(-2))=2-0.3464=1.65`
`:.pH=14-1.65=12.35`

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