Saved Bookmarks
| 1. |
The K_a value for HCN is 10^-9. What is the pH of 0.4 M HCN solution? |
|
Answer» SOLUTION :`K_a=10^-9` `C=0.4M` `pH=-log[H^+]` `[H^+]=SQRT(K_a TIMES c)` `[H^+]=sqrt(10^-9 times0.4)` `[H^+]=2 times10^-5` `thereforepH=-log(2 times10^-5)` `=-log2-log(10^-5)` `=-0.3010+5` `pH=4.699` |
|