Prelab4 - Cu = Wt CuSCN m.m. CuSCN x 1 Cu 1 CuSCN x m.m. Cu...

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Precipitation Mix solutions containing ions of sparingly soluble salt: AgNO 3 + NaCl -----> AgCl(s) + NaNO 3 Precipitation from Homogeneous Solution: (H 2 N) 2 CO + 3H 2 O -----> CO 2 + 2NH 4 + + 2OH - Urea M 3+ + 3OH - -----> M(OH) 3 (s) M = Fe, Al
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Precipitation of Cuprous Thiocyanate Cu 2+ + nSCN - Cu(SCN) n 2-n Blue Green 4Cu 2+ + 2HONH 3 + -----> 4Cu + + N 2 O + H 2 O + 6H + Cu + + SCN - -----> CuSCN(s) White
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Sample Calculation Calculate Wt% Cu if 0.9874 g sample gives 0.1771 g of CuSCN. Wt Cu = Moles Cu x m.m. Cu = Moles CuSCN x Stoi. Ratio x m.m.
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Unformatted text preview: Cu = Wt CuSCN m.m. CuSCN x 1 Cu 1 CuSCN x m.m. Cu = 0.1771 g 121.624 g/mol x 1 x 63.546 g/mol = 0.09253 g Wt% Cu = 0.09253 g 0.9874 g x 100% = 9.371 % Data Treatment Errors are not random. Low results much more likely. Q-Test not reliable. For Experiment 4 ONLY 1. Calculate all (4) Wt% Cu. 2. Arrange in increasing order. 3. Multiply highest result by 0.99 (99%). 4. Reject any result lower than 99% of highest Wt% Cu....
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Prelab4 - Cu = Wt CuSCN m.m. CuSCN x 1 Cu 1 CuSCN x m.m. Cu...

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