(conceptual chemistry question. more than one person can explain please!) it is

Question

(conceptual chemistry question. more than one person can explain please!) it is consider the following reaction :HNO2 (aq) + H2O (l) *insert forwards and reverse arrows here* H3O ^+ (aq) + NO2^- (aq). In which direction will equilibrium shift if (a) NaOH is added? (b) NaNO2 is added? (c) HCl is added? i understand what Le Chateliers principle is completely. I just have a hard time identifying if the for example HCl or NaOH will be added to the reactants side or products side, how do i know if its a reactant being added or product? im sorry, i just need someone to please dumb it down. thank you. Consider the following equilibrium for nitrous acid, HNO2, a weak acid: HNO2 (aq) + H20(1) H30+ (aq) + NO2-(aq) In which direction will the equilibrium shift if a. NaOH is added? NaNO2 is added? Sh:f+ 404he b.

Explanation / Answer

a)

If we add NaOH    it will react with H3O+ giving

                       NaOH + H3O+   . NaOH + H2O

Since product component is removed so equilibrium shifts in forward direction forming of product

b)

If we add NaNO2 it will provide NO2 - so it adds to products .Equilibrium shifts backwards to reactants side to remove NO2 -

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