Question

The pH of `10^(-2)` M `Ca(OH)_(2)` is
A. 112
B. 6.96
C. 7.2
D. 6

Answer 1

Correct Answer - B
`Ca(OH)_(2)hArr Ca^(2+)+2OH`
`|OH^(-)|=2 xx 10^(-2)M:`
`|H^(+)|=(K_(w))/(|OH|)=(10^(-14))/(2 xx 10^(-2))=5 xx 10^(-13)M`
`pH =log |H^(+)|=-log [5 xx 10^(-3)|`
`=13-log5=13-0.69%=12.3010`