You visited us 1 times! Enjoying our articles? Unlock Full Access!

Henderson Hassleback Equation

What is the p...

Question

What is the pH of a 0.50 M aqueous NaCN solution?

[ $p K_{a}$ of HCN is 9.22]

11.8

No worries! We‘ve got your back. Try BYJU‘S free classes today!

12.1

No worries! We‘ve got your back. Try BYJU‘S free classes today!

10.7

No worries! We‘ve got your back. Try BYJU‘S free classes today!

11.5

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D 11.5
Given that- $p K_{a} = 9.22, C = 0.5 M$
$\begin{matrix} N a C N & + & H_{2} O & ⟶ & N a O H & + & H C N 0.5 & 0.5 & 0.5 \end{matrix}$

We know that,
$p H = \frac{1}{2} [p K_{w} + p K_{a} + log C]$

$= \frac{1}{2} [14 + 9.22 + log (05)]$

$p H = \frac{22.92}{2} = 11.5$

option D

Suggest Corrections

Similar questions

p H

H C N

N a C N

N a C N

C N^{⊝}

H C N

p K_{b}

C N^{-}

25^{o} C

p H

N a C N

p H

0.10 M

N a C N (a q), K_{a}

H C N

4.9 \times 10^{- 10}

25^{o} C

p K_{b}

C N^{-}

25^{o}

4.7

p H

0.5 M

N a C N

p H

0.1 M

25^{o} C

Given : p K_{a} (H C O O H) = 3.8 a n d p K_{b} (N H_{4} O H) = 4.8

Join BYJU'S Learning Program