empty 10-mL volumetric flask weighs 10.263 g. After filling to the mark with dis
ID: 887127 • Letter: E
Question
empty 10-mL volumetric flask weighs 10.263 g. After filling to the mark with distilled water at 20°C, the mass is 20.211 g What is the mass of water in the flask? Number 9.948 What is the true volume of the flask at 20°C? (Be sure to correct for buoyancy.) | Temperature | Density Volume of 1 g of water (mL) corrected for buoyancy 10 15 20 25 30 (g/mL) 0.9997026 1.0014 0.9991026 1.0020 0.9982071 1.0029 0.9970479 1.0040 0.9956502 1.0054 Number 9.948 mL Incorrect. You have found the correct mass of water in the flask, 9.948 g. According to a density table, the volume of 1 g of water at 20°C is 1.0029 mL/1 g. Multiply the volume of 1 g of water by the mass of water in the flask to find the true volume of the flask. Make sure you have enough significant figures in your responsExplanation / Answer
mass of water = 9.948 grams
volume of flask = mass / 1.0029 g/ml
= 9.948/1.0029 = 9.9768492
= 9.919 ml
let us consider 1.0 gram substance
so the volume at 15 C = 1/0.9991026 = 1.0008982 ml
the volume at 30 C = 1/0.9956502 = 1.0043688 ml
volume expanded = 0.0034706 ml
percentage expansion = (0.0034706/1.0008982)*100
= 0.347%
b) M1V1 = M2V2
0.5210*1.0008982 = M2*1.0043688
M2 =molarity at 30 C= 0.5192 M
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