Question

1. List all the anions in this lab that are identified using:
A. precipitation reactions
B. redox reactions
C. acid-base reactions
D. gas-forming reactions

The Equations Given:

Ca+2(aq) + SO4 -2(aq) ↔ CaSO4(s) Equation 1

Ca+2(aq) + CO3 -2(aq) ↔ CaCO3(s) Equation 2

CaCO3(s) + 2H+ (aq) → Ca+2(aq) + CO2(g) + H2O(l) Equation 3

CaSO4(s) + H+ (aq) → No Reaction (precipitate remains) Equation 4

2NO2 - (aq) → NO(aq) + NO3 - (aq) Equation 5

2NO(g) (colorless) + O2(g) → 2NO2 (g) (red-brown) Equation 6

Ag+ (aq) + Cl- (aq) ↔ AgCl(s) Equation 7

Ag+ (aq) + Br- (aq) ↔ AgBr(s) Equation 8

Ag+ (aq) + I - (aq) ↔ AgI(s) Equation 9

Cl2(aq) (colorless) + Cl- (aq) (colorless) → No Reaction Equation 10

Cl2(aq) (colorless) + Br- (aq) (colorless) → Br2(aq) (yellow to brown ) + Cl- (aq) (colorless) Equation 11

Cl2(aq) (colorless) + I - (aq) (colorless) → I2(aq) (yellow to brown) + Cl- (aq) (colorless) Equation 12

NO3 - (aq) + 4H+ (aq) + 3Fe2+(aq) → NO(aq) + 3Fe3+(aq) + 2H2O(l) Equation 13

2NO(g) (colorless) + O2(g) → 2NO2(g) (red-brown) Equation 14

Answer 1

Ca+2(aq) + SO4 -2(aq) ↔ CaSO4(s) Equation 1    precipitation

Ca+2(aq) + CO3 -2(aq) ↔ CaCO3(s) Equation 2       precipitation

CaCO3(s) + 2H+ (aq) → Ca+2(aq) + CO2(g) + H2O(l) Equation 3    gas forming reaction

CaSO4(s) + H+ (aq) → No Reaction (precipitate remains) Equation 4

2NO2 - (aq) → NO(aq) + NO3 - (aq) Equation 5    redox reaction

2NO(g) (colorless) + O2(g) → 2NO2 (g) (red-brown) Equation 6        redox reaction

Ag+ (aq) + Cl- (aq) ↔ AgCl(s) Equation 7    precipitation reaction

Ag+ (aq) + Br- (aq) ↔ AgBr(s) Equation 8      precipitation

Ag+ (aq) + I - (aq) ↔ AgI(s) Equation 9            precipitation

Cl2(aq) (colorless) + Cl- (aq) (colorless) → No Reaction Equation 10

Cl2(aq) (colorless) + Br- (aq) (colorless) → Br2(aq) (yellow to brown ) + Cl- (aq) (colorless)   redox reaction

Cl2(aq) (colorless) + I - (aq) (colorless) → I2(aq) (yellow to brown) + Cl- (aq) (colorless)    redox reaction

NO3 - (aq) + 4H+ (aq) + 3Fe2+(aq) → NO(aq) + 3Fe3+(aq) + 2H2O(l) Equation 13   redox reaction

2NO(g) (colorless) + O2(g) → 2NO2(g) (red-brown) Equation 14          redox reaction