Essay by frank13579High School, 12th gradeA, October 2014

Keywords

Investigation of Proper Experimental

Lab Techniques and Recording of Uncertainties

Chloe Yoo

October 3rd, 2014

Mrs. Mohuruk

Data Processing

Table 1: Station 1 - Density of Water Using 50ml Graduated Cylinder

 Trial 1 Trial 2 Trial 3 Trial 4 Mass of Beaker (g) 51.000.01 51.310.01 50.920.01 51.390.01 Mass of Beakerand Solution (g) 60.530.01 60.030.01 60.470.01 60.840.01 Mass of Solution (g) 9.530.02 8.720.02 9.550.02 9.450.02 Volume (mL) 10.00.05 9.900.05 10.000.05 9.900.05 Density (g/mL) 0.950.71% 0.880.74% 0.960.71% 0.950.72% Uncertainty (%) 0.71 0.74 0.71 0.72 Percent Error (%) 5 12 4 5

Calculation Example (Trial 1):

Mass of Solution = (Mass of Beaker and Solution) - (Mass of Beaker)

= 60.53g0.01g - 51.00g0.01g = 9.530.0

Density of Solution = (Mass of Solution) (Volume of Solution)

* Change absolute certainty to relative uncertainty in order to do division.

9.53gÃÂ±0.02g = 9.53ÃÂ±0.21% g

10.0mL0.05mL = 10.000.50% mL

Density of Solution = 9.53ÃÂ±0.21%g 10.000.50%mL

= (9.5310.00) (0.21%+0.50%) = 1.050.71% g/mL

Percent Error = |(Measured Density - Accepted Density) Accepted Density| X 100%

*Accepted Density of Water = 1.00g/mL

Percent Error = |(0.95 - 1.00) 1.00| X 100% = |-0.05| X 100% = 5%

Table 2: Station 1 - Density of Water Using 10ml Graduated Cylinder

 Trial 1 Trial 2 Trial 3 Trial 4 Mass of Beaker (g) 50.080.01 51.550.01 50.790.01 50.770.01 Mass of Beaker andSolution (g) 59.870.01 61.100.01 60.370.01 60.750.01 Mass of Solution (g) 9.790.02 9.550.02 9.580.02 9.980.02 Volume (mL) 10.000.05 9.900.05 9.900.05 10.000.05 Density (g/mL) 0.980.70% .960.72% .970.72% 1.000.70 Uncertainty (%) 0.70 0.72 0.72 0.70 Percent Error (%) 2 4 3 0

Calculation Example (Trial 1):

Mass of Solution = (Mass of Beaker and Solution) - (Mass of Beaker)

= 59.87g0.01g - 50.08g0.01g = 9.790.02

Density of Solution = (Mass of Solution) (Volume of Solution)

* Change absolute certainty to relative uncertainty...