6hey no 1 tryin!!!
1. How much ammonia must be added to a 0.004 M Ag+ soln. to prevent the precip. of AgCl when [Cl-] reaches 0.001 M ? Ksp (AgCl) = 1.8 * 10 ^ -10 . Diss. const. for Ag(NH3)2 + = 6 * 10 ^ -8.
2. A conc. strong acid is added to a solid mixture of 0.015 mole samples of Fe (OH)2 and Ca (OH)2 placed in 1 L of water . At what value of pH will the dissolution of each hydroxide be complete? (Assume negligible volume change)
Ksp[Fe(OH)2 = 7.9 * 10 ^ -15 and Ksp [Ca (OH)2 = 1.6 * 10^-19
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7 Answers
1357[Ag+][Cl-]=1.8*10-10
So [Ag+]=1.8*10-7
Ag(NH3)2+=0.004 M
Find [NH3]
1357Let the conc of Fe2+=x and OH-=y
then concentration of Ca2+=0.015-x
xy2=Ksp1
(0.015-x)y2=Ksp2
solve for x and y
6well i m not gettin rite answers by these methods
1st one is not as simple as it looks!!!
second one too the ans is not rite....
1357my answer for first one
[NH3]2=6×10-8*4*10-4/1.8*10-7=4/3 * 10-4
[NH3]=0.01155 M