Use the "x is small" approximation to find the concentration of the products in the following reaction which initially contains only 0.85 M HCN. Decide whether using the approximation was valid or invalid. HCN(aq) ⇌ H+(aq) + CN−(aq), Kc= 6.17 x 10−10

Concentration of product at equilibrium ;

Explanation:

initially

0.85 M        0    0

(0.85-x)M    x      x

The equilibrium constant of reaction =

The expression of an equilibrium cannot can be written as:

Solving for x:

x = 0.0000229

Concentration of product at equilibrium ;

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