Question

Write the hydrolysis reactions that will occur when then each of the following salts is added to water:

NaBr, Na₂CO₃, NH₄NO₃, NaF, and C₅H₅NHCl. (Don’t forget to remove the spectator ions.)

Predict whether each solution will be acidic, basic, or neutral in each case.

Answer 1

hydrolysis reactions = must react iwth water

a)

NaBr -- >Na+(aq) + Br-(aq)

neutral

b)

Na2CO3 --> 2Na+ + CO3-2(aq)

2Na+(aq) + CO3-2(aq) + H2O(l) <-> HCO3-(aq) + OH-(aq) + 2Na+(aq)

basic

c)

NH4NO3 --< NH4+(aq) + NO3-(aq)

NH4+(aq) + H2O(l) <-> H3O+ + NH3(aq)

then

NH4NO3 + H2O(l) --> NH3(aq) + H3O+(aq) + NO3-(aq)

acidic

d)

NaF

NaF --> Na+ + F-

F-(aq) + H2O(l) <-> HF(aq) + OH-(aq)

Na+(aq) + F-(aq) + H2O(l) <-> HF(aq) + OH-(aq) + Na(aq)

basic

e)

C5H5NHCl --> C5H5NH+(aq) + Cl -(aq)

C5H5NH+ + H"O <-> C5H5N H3O +

C5H5NHCl --> C5H5N(aq) + H3O+(aq) + Cl-(aq)

acidic