At a concentration of 1 M, the weak acid HNO 2 is 2% ionized, and the pH of the solution is 1.7. What happens when KNO 2 ( s ) is dissolved into the solution

Answer : When dissolved into the solution then the equilibrium will shift in the left direction.

Explanation :

Le-Chatelier's principle : This principle states that if any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

The dissociation reaction of is:

As we are adding  that means increase the concentration of then the equilibrium will shift in the left direction.

If the concentration of is increased on product side then the equilibrium will shift in the direction where decrease of concentration of

Hence, when dissolved into the solution then the equilibrium will shift in the left direction.

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the correct answer is:

a. formation of precipitation