Ionic Equilibrium!

Chemistry Level 3

What is the pH \text{pH} of a 0.50 M 0.50\text{ M} aqueous N a C N \ce{NaCN} solution ?

Given: p K b p{ K }_{ b } of C N − C{ N }^{ - } is 4.70.


The answer is 11.5.

Sahil Bansal by Sahil Bansal , 21, India

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1 solution

Spandan Senapati
Feb 28, 2017

Use salt hydrolysis.Here NaCN is a salt of strong base and weak acid so p H = 7 + 0.5 ( p K a + l o g c ) pH=7+0.5(pKa+logc) .and p K a + p K b = 14 pKa+pKb =14

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