Question

Write net ionic equations for the reaction, if any, that occurs when aqueous solutions of the following are mixed. a. chromium(III) chloride and sodium hydroxide b. silver nitrate and ammonium carbonate c. copper(II) sulfate and mercury(I) nitrate d. strontium nitrate and potassium iodide

Short answer

a. $C{r}^{3+}(aq)+3O{H}^{-}(aq)\to Cr(OH{)}_3(s)$ b. $2A{g}^{+}(aq)+C{O}_3^{2-}(aq)\to 2AgC{O}_3(s)$ c. $S{O}_4^{2-}(aq)+H{g}_2^{2+}(aq)\to H{g}_{2}S{O}_4(s)$ d. $S{r}^{2+}(aq)+2I^{-}(aq)\to Sr{I}_2(s)$

Step-by-step solution

Write the balanced molecular equation

CrCl3(aq) + 3NaOH(aq) -> Cr(OH)3(s) + 3NaCl(aq)

Break each reactant and product into ions

CrCl3 (aq) -> Cr3+ (aq) + 3Cl- (aq) NaOH (aq) -> Na+ (aq) + OH- (aq) Cr(OH)3 (s) -> Cr(OH)3 (s) NaCl (aq) -> Na+ (aq) + Cl- (aq)

Write the complete ionic equation

Cr3+(aq) + 3Cl-(aq) + 3Na+(aq) + 3OH-(aq) -> Cr(OH)3(s) + 3Na+(aq) + 3Cl-(aq)

Write the net ionic equation

Cr3+(aq) + 3OH-(aq) -> Cr(OH)3(s) b. silver nitrate and ammonium carbonate

Write the balanced molecular equation

2AgNO3(aq) + (NH4)2CO3(aq) -> 2Ag2CO3(s) + 2NH4NO3(aq)

Break each reactant and product into ions

AgNO3 (aq) -> Ag+ (aq) + NO3- (aq) (NH4)2CO3 (aq) -> 2NH4+ (aq) + CO3^2- (aq) Ag2CO3 (s) -> Ag2CO3 (s) NH4NO3 (aq) -> NH4+ (aq) + NO3- (aq)

Write the complete ionic equation

2Ag+(aq) + 2NO3-(aq) + 2NH4+(aq) + CO3^2-(aq) -> 2AgCO3(s) + 2NH4+(aq) + 2NO3-(aq)

Write the net ionic equation

2Ag+(aq) + CO3^2-(aq) -> 2AgCO3(s) c. copper(II) sulfate and mercury(I) nitrate

Write the balanced molecular equation

CuSO4(aq) + 2HgNO3(aq) -> Cu(NO3)2(aq) + Hg2SO4(s)

Break each reactant and product into ions

CuSO4 (aq) -> Cu2+ (aq) + SO4^2- (aq) HgNO3 (aq) -> Hg2^2+ (aq) + 2NO3- (aq) Cu(NO3)2 (aq) -> Cu2+ (aq) + 2NO3- (aq) Hg2SO4 (s) -> Hg2SO4 (s)

Write the complete ionic equation

Cu^2+(aq) + SO4^2-(aq) + Hg2^2+(aq) + 2NO3-(aq) -> Cu^2+(aq) + 2NO3-(aq) + Hg2SO4(s)

Write the net ionic equation

SO4^2-(aq) + Hg2^2+(aq) -> Hg2SO4(s) d. strontium nitrate and potassium iodide

Write the balanced molecular equation

Sr(NO3)2(aq) + 2KI(aq) -> SrI2(s) + 2KNO3(aq)

Break each reactant and product into ions

Sr(NO3)2 (aq) -> Sr2+ (aq) + 2NO3- (aq) KI (aq) -> K+ (aq) + I- (aq) SrI2 (s) -> SrI2 (s) KNO3 (aq) -> K+ (aq) + NO3- (aq)

Write the complete ionic equation

Sr2+(aq) + 2NO3-(aq) + 2K+(aq) + 2I-(aq) -> SrI2(s) + 2K+(aq) + 2NO3-(aq)

Write the net ionic equation

Sr2+(aq) + 2I-(aq) -> SrI2(s)