Practice Problems

CH4 dissociation

CH4 --> (H2O) CH4

LiOH dissociation

LiOH --> (H2O) Li^+ + OH^-

Na3P (s) dissociation

Na3P (s) --> (H2O) 3Na^+ (aq) + P^-3 (aq)

If you have an aqueous solution that contains 1.5 moles of HCl, how many moles of ions are in the solution?

3.0 moles of ions

If 2.37 moles of Na2SO4 are dissolved into water, how many moles of ions are present in solution?

7.11 moles of ions

Al(OH)3 dissociation

Al(OH)3 --> (H2O) Al^3+ (aq) + 3OH^- (aq) + Al(OH)3

Predict the identity of the precipitate that forms when aqueous solutions of BaCl2 and K2SO4 are mixed.

BaSO4 (s)

What dissolved species are present in a solution of CCl4

CCl4

Ca(OH)2 dissociation

Ca(OH)2 --> (H2O) Ca^+2 + 2OH^-

Write the net ionic equation for the precipitation reaction that occurs when aqueous solutions of calcium chloride and sodium carbonate are mixed.

Ca^+2 (aq) + CO3^2- (aq) --> CaCO3 (s)

Solid chromium (III) hydroxide reacts with aqueous nitrous acid balanced molecular equation & net ionic equation

Cr(OH)3 (s) + 3HNO2 (aq) --> Cr(NO2)3 (s) + 3H2O (l)

HC2H3O2 dissociation

HC2H3O2 --> (H2O) H^+ + C2H3O2^- + HC2H3O2

HCl dissociation

HCl --> (H2O) H^+ (aq) + Cl^- (aq)

Aqueous nitric acid and aqueous ammonia react balanced molecular equation & net ionic equation

HNO3 (aq) + NH3 (aq) --> NH4^+ (aq) + NO3^- (aq) H^+ (aq) + NH3 (aq) --> NH4^+ (aq)

What dissolved species are present in a solution of KCN

K+ and CN-

What dissolved species are present in a solution of NaClO4

Na+ and ClO4^-

Which solute will cause the light bulb in the previous slide to glow most brightly, CH3OH, NaOH, or HC2H3O2? Why?

NaOH b/c ionic = strong base and electrolyte

Will a precipitate form when solutions of Ba(NO3)2 and KOH are mixed?

No

A compound was found to be soluble in water. It was also found that the addition of acid to an aqueous solution of this compound resulted in the formation of carbon dioxide gas. Which one of the following cations would form a precipitate when added to an aqueous solution of this compound? a. NH4+ b. Rb+ c. Mg2+ d. K+

c. Mg2+