Question

2Cr3+ + 3S+ 7H2O3H2S + Cr2O72-+ 8H+ In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent. name of the element oxidized: name of the element reduced: formula of the oxidizing agent: formula of the reducing agent:

b. Calculate the number of milliliters of 0.570 M Ba(OH)2 required to precipitate all of the Cr3+ ions in 114 mL of 0.656 M CrI3 solution as Cr(OH)3. The equation for the reaction is: 2CrI3(aq) + 3Ba(OH)2(aq) 2Cr(OH)3(s) + 3BaI2(aq) mL Ba(OH)2