Question

In a research project, a scientist adds 0.1 mole of HCN, 0.1 mole of H3O , and 0.1mole of CN- to water to make a total volume of 1 L. Will this reaction proceed to a greater extent in the forward direction or in the reverse direction

Answer 1

Answer:

Reverse; since the value of Q is greater than the value of K

Explanation:

The equation for the reaction can be expressed as:

$HCN + H_2 O$     ⇄    $H_3O^+ +CN^{-}$                $k_a = 6.2 * 10^ {-10$

$Q = \frac{[H_3O^+][CN^-]}{[HCN]}$  

$Q = \frac{(0.1)(0.1)}{(0.1)}$

Q = 0.1

$k_a = 6.2 * 10^ {-10$

Q > $K_{a}$

If the value of Q is greater than $K_{a}$ Value; the reaction will definitely shift to reverse direction.