Measurement of the pH of Dissolved Solids For each of the solids in Part B that

Question

Measurement of the pH of Dissolved Solids For each of the solids in Part B that undergoes hydrolysis state whether it is the anion or cation that hydrolyzes (you may assume it is one or the other, not both). Write the balanced chemical equation to show the hydrolysis reaction. Use the ionic form for the solid. State for each case which ion is a spectator ion. For each equation identify the two conjugate acid-base pairs. Sodium acetate equation: Ammonium chloride equation: Sodium bicarbonate equation:

Explanation / Answer

NaC2H3O2 <==> Na+ (aq) + C2H3O2^- (aq)

ion that will hydrolyze = C2H3O2^-

spectator ion = Na+

Reaction : C2H3O2^- (aq) + H2O (l) <==> HC2H3O2 (l) + OH- (aq)

                  conjugate base                          conjugate acid

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Nh4Cl <==> Nh4+ (aq) + Cl^- (aq)

ion that will hydrolyzed = NH4+

spectator ion = Cl^-

reaction : NH4+ (aq) + H2O(l) <==> NH4OH (l) + H+ (aq)

                conjugate acid                  conjugate base

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NaHCO3

ion that will hydrolyze = HCO3^-

spectator ion = na+

HCO3^- (aq) + H2O (l) <==> H2CO3 (l) + OH- (aq)

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