The net ionic equation is: This is a Mixed question/It is worth 4 points/You hav

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The net ionic equation is: This is a Mixed question/It is worth 4 points/You have unlimited attempts/There is no attempt penalty 10 Question (4 points) Q See page 168 When a solution of dithionite ions (5,0,-) is added to a solution of chromate ions (CrO1. the products of the ensuing chemical reaction, which occurs under basic conditions, include soluble sulfite ions and solid chromic hydroxide. This reaction is used to remove Cr(VI) from wastewater generated by factories that make chrome-plated metals

Explanation / Answer

mol of Chromate ions, CrO4-2 = MV = (1.41*10^-3)(125) = 0.17625 mol of CrO4-2

raito is

2 mol of CrO4-2 requires 3 mol of S2O4-2

0.17625 mol --> 3/2*0.17625 = 0.264375 mol of S2O4-2

NaS2O4 = S2O4-2 = 0.264375

mass of Na2S2O4 = mol*MW = 0.264375*174.10714

mass of Na2S2O4 = 46.029 g Na2S2O4 required

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