User:Elizabeth Ghias/Notebook/Experimental Chemistry/2012/10/05

Experimental Chemistry

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Objective To remake the CuSO4·5H2O and Ha2SO4 standards Description 0.0260 g CuSO4·5H2O was dissolved in 0.5 L water in a volumetric flask to create a 13.23 ppm solution of CuSO4·5H2O. Actual mass used was 0.0268 g CuSO4·5H2O 0.0148 g Na2SO4 was dissolved in 0.5 L water in a volumetric flask to create a 9.573 ppm solution co Na2SO4 Actual mass used was 0.0153 g Na2SO4 The 13.23 ppm CuSO4·5H2O solution was diluted See below for calculations Data No data was collected today. CuSO4·5H2O Calculations 20 ppm SO42- = 20 mg/L SO4 · 0.5 L = 10 mg SO42- · .1 g / 1000 mg = 0.01 g SO42- 0.01 g SO42- ÷ 96.06 g/mole = 1.041 × 10-4 moles SO42- · 1 mole CuSO4·5H2O / 1 mole SO42- = 1.041 × 10-4 moles CuSO4·5H2O 1.041 × 10-4 moles CuSO4·5H2O · 249.68 g/mole CuSO4·5H2O = 0.0260 g CuSO4·5H2O 1.041 × 10-4 moles CuSO4·5H2O · 1 mole Cu2+ / 1 mole CuSO4 = 1.041 × 10-4 moles Cu2+ 1.041 × 10-4 moles Cu2+ · 63.546 g/mole Cu2+ = 0.0066 g Cu2+ · 1000 mg / 1 g = 6.615 g Cu2+ ÷0.5 L: = 13.23 mg/L = 13.23 ppm Cu2+ Na2SO4 Calculations 20 ppm SO42- = 20 mg/L SO4 · 0.5 L = 10 mg SO42- · .1 g / 1000 mg = 0.01 g SO42- 0.01 g SO42- ÷ 96.06 g/mole = 1.041 × 10-4 moles SO42- · 1 mole Na2SO4 / 1 mole SO42- = 1.041 × 10-4 moles Na2SO4 1.041 × 10-4 moles Na2SO4 · 142.04 g/mole Na2SO4 = 0.0148 g Na2SO4 1.041 × 10-4 moles Na2SO4 · 2 moles Na2+ / 1 mole Na2SO4 = 2.082 × 10-4 moles Na+ 2.082 × 10-4 moles Na+ · 22.99 g/mole Na+ = 0.00478 g Na+ · 1000 mg / 1 g = 4.786 mg Na+ ÷ 0.5 L = 9.573 mg/L Na+ = 9.573 ppm Na+ CuSO4·5H2O Dilution Calculations (13.23 mg/L)X = (10 mg/L)(0.01 L) → X = 0.00756 L = 7.558 mL CuSO4·5H2O in 2.442 mL H2O (13.23 mg/L)X = (7 mg/L)(0.01 L) → X = 0.005291 L = 5.291 mL CuSO4·5H2O in 4.079 mL H2O (13.23 mg/L)X = (3 mg/L)(0.01 L) → X = 0.002268 L = 2.268 mL CuSO4·5H2O in 7.732 mL H2O (13.23 mg/L)X = (1 mg/L)(0.01 L) → X = 0.000756 L = 0.0756 mL CuSO4·5H2O in 9.244 mL H2O (13.23 mg/L)X = (0.25 mg/L)(0.01 L) → X = 0.000189 L = 0.189 mL CuSO4·5H2O in 9.811 mL H2O Na2SO4 Dilution Calculations (9.573 ppm) (9.573 ppm)X = (7 ppm)( Notes This area is for any observations or conclusions that you would like to note. Use categories like tags. Change the "Course" category to the one corresponding to your course. The "Miscellaneous" tag can be used for particular experiments, as instructed by your professor. Please be sure to change or delete this tag as required so that the categories remain well organized.