excess sodium cobalticyanide, Na3[Co(CN)6] to precipitate both cobalticyanide salts
Chapter 26, Problem 26-24(choose chapter or problem)
excess sodium cobalticyanide, Na3[Co(CN)6] to precipitate both cobalticyanide salts: AgNO3 FM 169.873 Ag3[Co(CN)6] FM 538.643 Hg2(NO3)2 FM 525.19 (Hg2)3[Co(CN)6]2 FM 1 633.62 (a) The unknown weighed 0.432 1 g and the product weighed 0.451 5 g. Find wt% AgNO3 in the unknown. Caution: Keep all the digits in your calculator or else serious rounding errors may occur. Do not round off until the end. (b) Even a skilled analyst is not likely to have less than a 0.3% error in isolating the precipitate. Suppose that there is negligible error in all quantities, except the mass of product, which has an uncertainty of 0.30%. Calculate the relative uncertainty in the mass of AgNO3 in the unknown.
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