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mixas84 [53]
1 year ago
5

Calculate the ph at the equivalence point for the titration of 0. 22 m hcn with 0. 22 m naoh. (ka = 4. 9 × 10^–10 for HCN).

Chemistry
1 answer:
denis-greek [22]1 year ago
4 0

The pH at the equivalence point for the titration of 0. 22 m HCN with 0. 22 m NaOH is 11.17

Calculation,

Concentration of NaCN = 0. 22 m/ 2 = 0.11 M ( at equal volumes of acid and base will be used).

The equilibrium is ,

HCN +H_{2} O  → H^{+} + CN^{-}

C(1-x)              Cx      Cx

Where x , is the degree of hydrolysis and

K_{h} = Cx^{2}/(1-x)

We know that K_{h} = K_{w}/K_{a} = 1 ×10^{-14}/4. 9 ×10^{-10} =  2.04×10^{-5}

K_{h} =  Cx^{2} =   2.04×10^{-5}  = 0.11 M×x^{2}

x^{2} =  2.04×10^{-5}/0.11 M

x = 1.36×10^{-2}

[OH^{-} ] = Cx =  1.36×10^{-2} × 0.11 M = 0.15×10^{-2}

[H^{+} ] =  1 ×10^{-14}/ 0.15×10^{-2} = 6.66×10^{-12}

pH = -㏒[H^{+} ] = -㏒6.66×10^{-12} = 11.17

The pH at the equivalence point for the titration is  11.17.

To learn more about  equivalence point

brainly.com/question/14782315

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