Saved Bookmarks
| 1. |
A solution saturated in lime water has a pH of 12 Then the `K_(sp)` for `Ca(OH)_(2)` is `:`A. `3.2xx10^(-3)`B. `1.25xx10^(-7)`C. `1.00xx10^(-7)`D. `3.2xx10^(-4)` |
|
Answer» Correct Answer - 2 `pH=12" "implies" "-log(H^(+))=12implies` `log[H^(+)]-12" "Ca(OH)_(2)hArr2OH^(-)+Ca^(2+)` `[H^(+)]=10^(-12)` `[OH^(-)]=(10^(-4))/(10^(-14))=10^(-2)` `K_(sp)=[Ca^(2+)][OH^(-)]^(-2)" "[Ca^(2+)]=(1)/(2)[OH^(-)]` `(10^(-2))xx((1)/(2)xx10^(-2))^(2)=1.25xx10^(-7)Ans.` |
|