Asked by Ali

Solid AgNo3 is added slowly to solution of 0.001M Cl,Br,and I
a)
at what concentration of Ag will AgI precipitating?
at what concentration of Ag will AgCl precipitating?
at what concentration of Ag will AgBr precipitating?
b)
calculate the percent % of I ppt before reaching of AgBr?
calculate the percent % of Br ppt before reaching of AgCl?
Answered by DrBob222
Ksp AgI = (Ag^+)(I^-)
You know Ksp and I^-, solve for Ag^+.
Same for AgBr and AgCl.

b part.
What is Ag^+ when AgBr first ppts. You calculated that above. Plug Ag+ from the AgBr when it first ppt into Ksp for AgI to find the I^- concn when AgBr starts. Then %I left at that point is [(I^-)/0.001]*100 = ? That's what's left so % pptd is 100%- ?%. There isn't much left and essentially all has been pptd. AgBr is done the same way.

Post your work if you need help understanding any of this.
Answered by Ali
thanksssss

I see what you said we used the Ag from AgBr to find the [I] by using the Ksp for AgI
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