4 pts A solution is made by mixing silver nitrate and barium nitrate so both compounds have a concentration of 0.50 M. Sodium chromate (Na2Cr04) is added to precipitate out both silver chromate and barium chromate. What is the silver ion concentration when barium chromate begins to precipitate? Ksp of silver chromate is 1.1 x 10-12 and barium chromate is 1.2 x 10-10 O 1.1 x 10-12 M O 1.3 x 10 4M 6.8 x 102 M O 6,5 x 10-5M O 3.2 x 104 M