MCQ
$NaO{H_{(aq)}},HC{l_{(aq)}}$ and $NaC{l_{(aq)}}$ concentration of each is ${10^{ - 3}}M$. Their $pH $ will be respectively
- A$10, 6, 2$
- ✓$11, 3, 7$
- C$10, 2, 6$
- D$3, 4, 7$
✓
Answer
Correct option: B.
$11, 3, 7$
b
$HCl$ is strong acid so it dissociates completely to give $\left[ H ^{+}\right]$ions whose concentration is $10^{-3} \,M$.
$HCl$ is strong acid so it dissociates completely to give $\left[ H ^{+}\right]$ions whose concentration is $10^{-3} \,M$.
As we know $pH =-\log \left(\left[ H ^{+}\right]\right)=3$
$NaOH$ is strong base so it dissociates completely to give $\left[ OH ^{-}\right]$ ions whose concentration is $10^{-3}\, M$.
As we know pOH $=-\log \left(\left[ OH ^{-}\right]\right)=3$
We also know that $pH + pOH =14$ so $pH =11$
$NaCl$ is salt os strong acid and strong base so it is neutral in nature so its $pH =7.$
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