Question

1) A solution contains 6.97×10^-3 M sodium iodide and 1.33×10^-2 M ammonium phosphate.  
Solid silver acetate is added slowly to this mixture.

A. What is the formula of the substance that precipitates first?

formula =

B. What is the concentration of silver ion when this precipitation first begins?  
[Ag⁺] =  M

2) A solution contains 1.22×10^-2 M potassium hydroxide and 9.68×10^-3 M ammonium sulfide.  
Solid copper(II) acetate is added slowly to this mixture.

A. What is the formula of the substance that precipitates first?

formula =

B. What is the concentration of copper(II) ion when this precipitation first begins?  
[Cu²⁺] =  M

3) A solution contains 9.54×10^-3 M sodium chromate and 1.40×10^-2 M ammonium sulfate.  
Solid lead nitrate is added slowly to this mixture.  

What is the concentration of chromate ion when sulfate ion begins to precipitate?  
[chromate] =  M

4) A solution contains 5.90×10^-3 M ammonium carbonate and 1.11×10^-2 M ammonium fluoride.  
Solid lead acetate is added slowly to this mixture.  

What is the concentration of carbonate ion when fluoride ion begins to precipitate?  
[carbonate] =  M

Answer 1