1) In photography, unexposed silver bromide is removed from film by soaking the

Question

1)

In photography, unexposed silver bromide is removed from film by soaking the film in a solution of sodium thiosulfate, Na2S2O3. Silver ion forms a soluble complex with thiosulfate ion, S2O32-, that has the formula Ag(S2O3)23-, and formation of the complex causes the AgBr in the film to dissolve. The Ag(S2O3)23- complex has Kform= 2.0 x 1013. How many grams of AgBr (Ksp= 5.4 x 10-13) will dissolve in 126 mL of 1.63 M Na2S2O3 solution?

2)Calculate the solubility of silver chloride in 0.36 M NH3 and compare it with its solubility in pure water. (Ksp for AgCl = 1.8 × 10-10)

Is the molar solubility of AgCl in 0.36 M NH3 is greater than in pure water OR is the molar solubility of AgCl in 0.36 M NH3 is less than in pure water?

3)A solution contains Ba2+ (1.0 × 10-3 M), Ca2+ (1.0 × 10-3 M) and K+ (1.0 × 10-3 M). Drops of a 5.0 × 10-1 M solution of NaF were added through a microburet until the [F-] in the solution mix reached 1.5 × 10-3 M. Should a precipitate form? If so, what is the precipitate? The Ksp values are BaF2: 1.0 × 10-6, CaF2: 5.3 × 10-9. (Neglect the slight change in volume resulting from the added NaF solution.)

4)Select the chemical equilibrium that corresponds to Kform for Ag(S2O3)23-.

5)Select the chemical equilibrium that corresponds to Kform for Zn(NH3)42+.

Zn2+(aq) + (NH3)4(aq) Zn(NH3)42+(aq)

6)

Select the chemical equilibrium that corresponds to Kformfor SnS32-.

Is the molar solubility of AgCl in 0.36 M NH3 is greater than in pure water OR is the molar solubility of AgCl in 0.36 M NH3 is less than in pure water?

3)A solution contains Ba2+ (1.0 × 10-3 M), Ca2+ (1.0 × 10-3 M) and K+ (1.0 × 10-3 M). Drops of a 5.0 × 10-1 M solution of NaF were added through a microburet until the [F-] in the solution mix reached 1.5 × 10-3 M. Should a precipitate form? If so, what is the precipitate? The Ksp values are BaF2: 1.0 × 10-6, CaF2: 5.3 × 10-9. (Neglect the slight change in volume resulting from the added NaF solution.)

4)Select the chemical equilibrium that corresponds to Kform for Ag(S2O3)23-.

Ag+(aq) + 2S2O32-(aq) Ag(S2O3)23-(aq) Ag+(aq) + 2S2O32-(aq) Ag(S2O3)23-(aq) Ag(S2O3)23-(aq) Ag+(aq) + 2S2O32-(aq) Ag+(aq) + 2S2O33-(aq) Ag(S2O3)23-(aq)

5)Select the chemical equilibrium that corresponds to Kform for Zn(NH3)42+.

Zn(NH3)42+(aq)Zn2+(aq) + 4NH3(aq) Zn2+(aq) + 4NH3(aq) Zn(NH3)42+(aq) Zn2+(aq) + 4NH3(aq) Zn(NH3)42+(aq)

Zn2+(aq) + (NH3)4(aq) Zn(NH3)42+(aq)

6)

Select the chemical equilibrium that corresponds to Kformfor SnS32-.

Sn+(aq) + 3S2-(aq) SnS32-(aq) Sn4+(aq) + 3S22-(aq) SnS32-(aq) Sn4+(aq) + (S22-)3(aq) SnS32-(aq) SnS32-(aq) Sn+(aq) + 3S2-(aq) SnS32-(aq) Sn4+(aq) + (S22-)3(aq) SnS32-(aq) Sn+(aq) + (S2-)3(aq) Sn4+(aq) + 3S22-(aq) SnS32-(aq)

Explanation / Answer

4)

Ag+(aq) + 2S2O32-(aq) Ag(S2O3)23-(aq)

5)

Zn2+(aq) + 4NH3(aq) Zn(NH3)42+(aq)

6)

Sn4+(aq) + 3S22-(aq) SnS32-(aq)

note : above problems i dont know. i know only these

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