User:Melissa Novy/Notebook/CHEM581/2012/09/19
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20 ppm SO_{4}^{2} Solutions
MW Na_{2}SO_{4}: 142.04 g/mol MW SO_{4}^{2}: 90.06 g/mol 0.001 g SO_{4}^{2} × (1 mol SO_{4}^{2}/90.06 g SO_{4}^{2}) × (1 mol Na_{2}SO_{4}/1 mol SO_{4}^{2}) × (142.04 g Na_{2}SO_{4}/1 mol Na_{2}SO_{4}) = 0.001479 g Na_{2}SO_{4} Actual mass Na_{2}SO_{4}: 0.00150 g 0.00150 g Na_{2}SO_{4} × (1 mol Na_{2}SO_{4}/142.04 g Na_{2}SO_{4}) × (1 mol SO_{4}^{2}/1 mol Na_{2}SO_{4}) × (96.06 g SO_{4}^{2}/1 mol SO_{4}^{2}) = 0.00101 g SO_{4}^{2} Actual concentration: (0.00101 g SO_{4}^{2}/0.5 L) × 10^{6} = 2020 ppm SO_{4}^{2} (2020 ppm)(V_{1}) = (20 ppm)(0.5 L) V_{1} = 0.00495 L
MW CuSO_{4}·5H_{2}O: 249.69 g/mol 0.001 g SO_{4}^{2} × (1 mol SO_{4}^{2}/90.06 g SO_{4}^{2}) × (1 mol CuSO_{4}·5H_{2}O/1 mol SO_{4}^{2}) × (249.68 g CuSO_{4}·5H_{2}O/1 mol CuSO_{4}·5H_{2}O) = 0.00256 g CuSO_{4}·5H_{2}O Actual mass CuSO_{4}·5H_{2}O: 0.00252 g CuSO_{4}·5H_{2}O 0.00252 g CuSO_{4}·5H_{2}O × (1 mol CuSO_{4}·5H_{2}O/249.68 g CuSO_{4}·5H_{2}O) × (1 mol SO_{4}^{2}/1 mol CuSO_{4}·5H_{2}O) × (96.06 g SO_{4}^{2}/1 mol CuSO_{4}·5H_{2}O) = 0.00097 g SO_{4}^{2} Actual concentration: (0.00097 g SO_{4}^{2}/0.5 L) × 10^{6} = 1939 ppm SO_{4}^{2} (1939 ppm)(V_{1}) = (20 ppm)(0.5 L) V_{1} = 0.00516 L
