9.
AgBr(s) <==> Ag+(aq) +
Br-(aq);
Ksp = 1.8 x 10-13 ----------------(1)
Ag+(aq) + 2NH3(aq) <==>
[Ag(NH3)2]+ Kf
= 1.7 x 107
----------------(2)
------------------------------------------------------------------------------------------.
AgBr(s) + 2NH3(aq) <==>
[Ag(NH3)2]+(aq) +
Br-(aq); Kc = Ksp x Kf
So,
Kc = (1.8 x 10-13) x (1.7 x 107)
= 3.06 x 10-6
But,
Kc = [Ag(NH3)2+]
[Br-] / [NH3]2
3.06 x 10-6 = (x)(x) / (0.5 - 2x)2
3.06 x 10-6 = x2 / (0.5)2
x2 = (3.06 x 10-6) x (0.25)
x2 = 7.65 x 10-7
x = 8.75 x 10-4
So, answer is option (A) 8.7 x 10-4 M
10.
ZnCO3 will dissociate as follows;
ZnCO3 <==> Zn2+ + CO32-(aq);
When Na2CO3 is added, it will dissociate as follows;
Na2CO3 <==> 2 Na+ + CO32-(aq);
So, more CO32-(aq) formed will react with Zn2+ to produce back ZnCO3.
So, answer is option (B) Na2CO3.
#9 and #10 Thank you solubility of the slightly soluble salt The solubility of AgCl is...
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