Add the two equations below:
Eqn 1 : AgBr(s) ⇌
Ag+ (aq) + Br -(aq) ; Ksp =5.0 x 10 -13
Eqn 2 :
Ag+ (aq) + 2 S2O32-(aq) ⇌ [Ag(S2O 3)2] 3-(aq) ; K f = 2.9 x 10 13
AgBr(s) + 2 S2O 32-(aq) ⇌ [Ag(S 2O 3) 2] 3- (aq) + Br -(aq)
We added the equations and it became exactly the overall equation.
This means we can simply multiply the constants to get the overall constant.
Keq = 14.5
'Make ICF chart:
Take note that since the solution is only 1 L, moles and molarities can be interchangeable.
x = 0.2210 M
Solutions of sodium thiosulfate are used to dissolve unexposed AgBr (K sp = 5.0 X 10 -13) in the developing process for blackand- white film. What mass of AgBr can dissolve in 1.00 L of 0.500 M Na2S2O3? Ag+ reacts with S2O32- to form a complex ion:
Ag+(aq) + 2S2O32-(aq) ⇌ Ag(S2O3)23-(aq)
K = 2.9 X 10 13
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