3. How many mL of 0.125 M Cr3+ must be reacted with 12.00 mL of 0.200 M MnO4 if the redox products are Cr2O72- and Mn2+ ? 4. Silver arsenate, Ag3ASO4, is very insoluble. What weight of AgzAsO4 precipitate forms when 27.00 mL of 0.180 M AgNO3 is mixed with 15.00 mL of 0.130 M Na3AsO4? 5. How many mL of concentrated HCl (density = 1.18 g/mL, 36.0 wt% HCI, MW = 36.5) should be diluted to 1.00 L to produce a 0.100 M solution