Lab Report (Experiment 2)

Lab Report (Experiment 2) - Experiment 2 2/26/12 Precision...

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Experiment 2 Precision and Accuracy of Measurements 2/26/12 A. Balance: When is a gram, a gram? Mass Sweetner, Nominal (g) 1.0 g Mass Empty Packet (g) .280 g 2 Balance, Used in step A-2 S t e p A - 2 Packet # Mass Packet + Contents (g) Mass Contents, Calculated (g) % error Contents 1 1.295 1.015 1.5% 2 1.399 1.119 11.9% 3 1.319 1.039 3.9% 4 1.330 1.050 5.0% 5 1.239 .959 4.1% Average 1.0364 5.28% Standard Deviation .05802 S t e p A - 3 Balance # Mass Packet + Contents (g) Mass Contents, Calculated (g) % error Contents 1 1.233 .953 4.7% 2 1.237 .957 4.3% 3 1.242 .962 3.8% 4 1.237 .957 4.3% 6 1.236 .956 4.4% Average .957 4.3% Standard Deviation .00324 B. Measuring Liquids Graduated Cylinder Cylinder Size Smallest Graduation (ml) Precision ± (ml) 25 .5 mL +/- .1 mL 1
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Experiment 2 Precision and Accuracy of Measurements 2/26/12 100 1 mL +/- .1 mL 1000 10 mL +/- 1 mL Delivering Liquid with various glasswares Temp. Water (°C) 21 Density Water (g/ml) .9979955 *See Appendix for density of water at the recorded temp. 10 ml Grad. Cylinder Vol. water (ml) Mass Beaker + Water (g) Mass Water, per 10 ml aliquot (g) Vol. calculated, per 10 ml (ml) 0 58.278 10 67.945 9.667 9.686 20 77.816 9.871 9.891 30 87.520 9.704 9.723 8 pts for whole table Average 9.767 Standard Deviation .10925 10 ml Serological Pipet Vol. water (ml) Mass Beaker + Water (g) Mass Water, per 10 ml aliquot (g) Vol. calculated, per 10 ml (ml) 0 58.278 10 68.287 10.009 10.029 20 78.140 9.853 9.873 30 88.011 9.871 9.891 Average 9.931 Standard Deviation .08535 2
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Experiment 2 Precision and Accuracy of Measurements 2/26/12 10 ml Volumetric Pipet Vol. water (ml) Mass Beaker + Water (g) Mass Water, per 10 ml aliquot (g) Vol. calculated, per 10 ml (ml) 0 58.278 10 68.300 10.022 10.042 20 77.960 9.66 9.679 30 87.975 10.015 10.035 Average 9.919 Standard Deviation .20759 C. Serial Dilutions: Making Solutions with Known Concentrations Sample Calculations: ( Use Microsoft Equation Editor) 1. Concentration of 1 st solution: Koolaid Favor Mass Concentration of 1 st solution (M) Concentration of 2 st solution (M) Blue 1.001g 2. Concentration of 2 st solution: 3
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Experiment 2 Precision and Accuracy of Measurements 2/26/12 Kool-Aid Color Transmitted BLUE Color Absorbed YELLOW λ max, absorbed (nm) 627 nm 4
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Lab Report (Experiment 2) - Experiment 2 2/26/12 Precision...

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