Part A: Determination of Densities of Pure Water and Calcium Chloride Solutions
Temperature of water (to nearest 0.5 ˚C) 22.5 ˚C
Mass of empty volumetric flask with stopper 20.3872 g
Mass of volumetric flask, stopper, and water 21.3762 g
Mass of water in the volumetric flask 0.9890 g
Calculated density of water at temperature ((4) / 1.00 mL) 0.9890 g/mL
Density of water at temperature ( from CRC Handbook (22.5 o C) 0.997655 g/mL https://www.simetric.co.uk/si_water.htm )
Percent Error Calculation:
Error = Actual Value – Experimental
%Error = 0.8675%
| (7) |
10.% solution |
20.% solution |
25% solution |
30.% solution |
40.% solution |
50.% solution |
Unknown solution |
|
Mass of stoppered flask containing Solution (g) |
21.4707 |
21.5647 |
21.6253 |
21.6692 |
21.7823 |
21.8699 |
21.7699 |
|
Mass of Solution (g) |
1.0835 |
1.1775 |
1.2381 |
1.2820 |
1.3951 |
1.4827 |
1.3827 |
Volume of Solution |
1.00 mL |
1.00 mL |
1.00 mL |
1.00 mL |
1.00 mL |
1.00 mL |
1.00 mL |
|
Density of Solution (g/mL) |
1.0835 |
1.1775 |
1.2381 |
1.2820 |
1.3951 |
1.4827 |
1.3827 |
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Plot the data:
Determine Mass% CaCl 2 in unknown solution from trendline equation on graph: 39.78 %
Graph Equation, Y = 0.01x + 0.9849
1.3827 = 0.01x + 0.9849
0.01x = 1.3827
0.01x = 0.3978
X = 39.78%
Specific gravity of 50% by mass solution:
Specific gravity+ mass of substance /mass of water
s.g = 1.4827/0.9890
s.g = 1.4992
Part B: Determination of Density of an Unknown Metal Sample by Water Displacement
|
Trial 1 |
Trial 2 |
|
Mass of empty container(optional) |
3.6512 g |
3.4889 g |
|
Mass of container + metal (optional) |
23.9852 g |
24.3066 g |
|
Mass of metal ( g ) |
20.334 |
20.8177 |
Water volume before metal |
14.60 mL |
13.05 mL |
Water volume after metal |
22.25 mL |
21.00 mL |
|
Volume of metal ( mL ) |
7.65 |
7.95 |
|
Density of metal ( g/mL ) |
2.6580 |
2.6186 |
Average density of unknown metal ______2.6383g/mL______________
Identity of metal (from Table 1) ______Aluminum_______________
Percent Error:
%Error = 2.2852%
Part C: Determination of the Thickness of the Unknown Metal Foil Sheet
|
Density ( Part B ) |
Foil Mass |
Foil Length |
Foil Width |
Foil Thickness |
|
1.2049 g |
10.55 cm |
4.25 cm |
0.0488 cm |
Thickness:
Density = Mass/Volume
2.6383 = 1.2049/V
2.6383/1.2049 = V
Volume = 2.1896mL
Volume = Length×Width×Thickness
2.1896 = 10.55×4.25×T
2.1896 = 44.8375T
2.1896/44.8375 = T
Thickness = 0.0488 cm
