Question 1
What is the molar solubility of AgCl in 0.10 mol L
-1 NaCN if the colourless complex ion Ag(CN)
2- forms?
Ksp for AgCl is 1.8 × 10
-10 and
Kf for Ag(CN)
2- is 1.0 × 10
21.
◦ 0.050 mol L
-1◦ 0.40 mol L
-1◦ 0.10 mol L
-1◦ 0.20 mol L
-1Question 2
Solid potassium chromate (K
2CrO
4) is slowly added to a solution containing 0.50 mol L
-1 AgNO
3 and 0.50 mol L
-1 Ba(NO
3)
2. What is the Ag
+ concentration when BaCrO
4 just starts to precipitate? The
Ksp for Ag
2CrO
4 and BaCrO
4 are 1.1 × 10
-12 and
respectively.
◦ 6.8 × 10
-2 mol L
-1◦ 6.5 × 10
-5 mol L
-1◦ 1.3 × 10
-4 mol L
-1◦ 3.2 × 10
-4 mol L
-1