Question

Using the molar ratio of the redox reaction between chromium as potassium dichromate and Fe2+ as ferrous ammonium sulfate, how can we determine how much of the ferrous ammonium sulfate (solid) should be added to a 20mL sample of wastewater containing 600mg/L of chromium (from potassium dichromate) in order to reduce the hexavalent chromium to trivalent chromium?

Based on
6Fe2 + Cr2O7 2- + 14H+ - - > 2Cr 3+ + 7H2O + 6Fe 3+

Answer 1

1 2 Ferrus a mmeniuw sulphare 3 xlo 9 3 6 x 392 x1 52. Thus 0.27133 ‘f FAS ld be added to su lphat,) to reduce hexavalent churwum丸 in order cy a5 per

Conve ting given PPm cuncen tralion t. molaviry Molarih メ 2yo.er 52.g-x1。wg 6 o o M- Molavily (-) 3 o 4 0 -3 wet x 392 ws 120メ5.769 y 392 x'oy 0-2313