Question

Explain Only #2,#3,#4 per Le Châtelier and whether the #2,#3,#4 reaction moves Left or Right

1.Silver carbonate equilibrium. In a 150-mm test tube add 10 drops of 0.01 M AgNO3 to 10 drops of 0.1 M Na2CO3. Add drops of 6 M HNO3 to the precipitate until evidence of a chemical change occurs. Record your observations. Explain them based on the equation below. (Caution: 6 M HNO3 reacts with the skin!) Ag2CO3(s) ⇌ 2 Ag+ (aq) + CO3 2-(aq)

CO3 2-(aq) + 2 H+ (aq) →H2CO3 (aq) →H2O (l) + CO2 (g)

Solution	∆ Color & Observation
10 drops of 0.01 M AgNO3	Clear
10 drops of 0.1 M Na2CO3	White Viscosity
6 M HNO3	Clear

2.Silver chloride equilibrium. To the clear solution from Part B .1, add 5 drops of 0.1 M HCl. Add drops of concentrated NH3 (Caution! avoid breathing vapors and avoid    skin contact) until evidence of a chemical change. Reacidify the solution with HNO3 (Caution!), record and explain your observations. What happens if excess concentrated NH3 is again added?

Ag+(aq) + Cl-(aq) ⇌ AgCl(s)

Ag+(aq) + 2 NH3(aq) ⇌   Ag[NH3)2]+(aq)

Solution	∆ Color & Observation
add 5 drops of 0.1 M HCl	Precipitate Formed
Concentrated NH3	Clear
After 6 Drops HNO3	It Turned Cloudy
After 3 Drops of NH3	Clear

3.Silver iodide equilibrium. After trying it, add drops of 0.1 M KI. Record and explain your observations.

Ag+(aq) + 2 NH3(aq) ⇌ Ag[NH3)2]+(aq)

Ag+(aq) + I-(aq) ⇌ AgI(s)

Solution	∆ Color & Observation
0.1M KI	Green & White Viscosity

4.Silver sulfide equilibrium. To the mixture from Part B.3, add drops of 0.1 M Na2S until evidence of chemical change has occurred. Record and explain your observations.

Ag+(aq) + I-(aq) ⇌ AgI(s)

Ag+(aq) + ½ S2-(aq) ⇌ Ag2S(s)

Solution	∆ Color & Observation
1 drop 0.1 M Na2S	It Turned Brown

Answer 1