solution will be diluted to create 5 standard solutions: Volume of FeSCN2+ Stock Solution (mL) 0.00 5.00 4.00 3.00 2.00 1.00 Standard Solution Standard Solution 0 1 2 3 4 5 he concentration of FeSCN2+ in each standard solution? (Show ALL calculations for 0 Volume of HNO3 (mL) 5.00 0.00 1.00 2.00 3.00 4.00 Concentration of FeSCN2+ Stock Solution (M)

Some wastewater stream contains 0.015 M Hg22+. Some chemical engineer decides to remove it by precipitating it as Hg2CO3(s). He mixes 100.00 ml of the wasterwater with 100.00 ml of a 2.00 M solution of Na2CO3 and filters the result to remove the solid. How much residual Hg22+ should he expect to find still in the water? (Hint: it should not be 0) Ksp of. Hg2CO3 = 9.0 x 10-15. Also keep in mind that Hg+ is the only ion that exists in solutions as a dimer, i.e. Hg22+, not 2 Hg+ (Hg2CO3→ Hg22+ + CO32-)

A solution contains 0.0450 M Ca2+ and 0.0940 M Ag+. If solid Na3PO4 is added to this mixture, which of the phosphate species would precipitate out of solution first? Ca3(PO4)2 Ag3PO4 Na3PO4 When the second cation just starts to precipitate, what percentage of the first cation remains in solution? percentage: 13.93 Incorrect %

A quantitative analysis for ethanol, C2H60, is accomplished by a redox back titration. Ethanol is oxidized to acetic acid, C2H402, using excess dichromate, 3+ Cr207 2-, which is reduced to Cr3*. The excess dichromate is titrated with Fe2*, giving C and Fe+ as products. In a typical analysis, a 5.00-mL sample of a brandy is diluted to 500 mL in a volumetric flask. A 10.00-mL sample is taken and the ethanol is removed by distillation and collected in 50.00 mL of an 2- acidified solution of 0.0200 M K2Cr207. Titration of the unreacted Cr207 requires 21.48 mL of 0.1014 M Fe2*. Calculate the %w/v ethanol in the brandy. Which is the titrant in this problem? C2H402 Fe2+ C2H60 O Cr207 2-