Posted by Jessica on Sunday, June 16, 2013 at 9:40pm.
0.125g of sodium dichromate is to be reacted wtih 0.025M potassium iodide. How many mLs of the potassium iodide solution will be needed.

Chemistry  bonjo, Sunday, June 16, 2013 at 11:25pm
1. balance equation is;
Na2Cr2O7 + 2KI > 2NaI + K2Cr2O7
mass of Na2Cr2O7 = 0.125g
mole of Na2Cr2O7 = m/Mr = 0.125g/Mr =___mole
mole ratio
Na2Cr2O7 : KI
1 : 2
2.calculate the mole of KI using the mole ratio above and mole of Na2Cr2O7.
volume of KI = n/M where n is the mole you calculate in 2 for KI and M is the molarity of KI.
the molarity is in mol/L so the volume you will get is in liters.
hope that helps..
mole of