An alloy sample weighing 5.00 g contains Cr. The Cr is chemically converted to a K2Cr2O7 solution. The Cr2O7-2 ion in the solution is completely and exactly converted to Cr 3 by reacting it with 4.73 g of I2. What is the % Cr in the alloy?
Need to balance: Cr207^2- + I2 ---> Cr^3+ + IO3^-
You want to prepare 450.0 ml of a 145 pm K+ ion solution. The density of the solution is 1.01g/mL. Disposal solution is 0.728M K2SO4. How many mL of the K2SO4 do you need to use?