Arsenic(III) oxide (As,O,) is available in pure form and is a usetul (but carcinogenic) primary standard for oxidizing agents such as MnO. The As,O, is dissolved in base and then titrated with MnO, in acidic solution. A small amount of iodide (I) or iodate (10,) is used to catalyze the reaction between H,AsO, and MnO. As O3 + 40H 2HASO + H,O HASO; + 2H H;ASO3 5H AsO, + 2MNO + 6H" 5H3ASO4 + 2Mn? 5H3ASO4 + 2Mn + 3H,O (a) A 3.214-g aliquot of KMNO4 (FM 158.034) was dissolved in 1,000 L of water, heated to cause any reactions with impurities to occur, cooled, and filtered. What is the theoretical molarity of this solution if no MnO, was consumed by impurities? (b) What mass of As,O3 (FM 197.84) would be just sufficient to react with 25.00 mL of the KMNO, solution in part (a)? (e) It was found that 0.146 8 g of As,O, required 29.98 mL of KMnO. solution for the faint color of unreacted MnO4 to appear. In a blank titration, 0.03 ml of MnO, was required to produce enough color to be seen. Calculate the molarity of the permanganate solution