Pre-Lab:
1. What is the equation for density?
The Density Calculator uses the formula that density (p) is equal to mass (M) divided by volume (V) or p=M/V. The calculator can use any two of the values to calculate the third. Density is defined as mass per unit volume.
2. Small metal pieces are added to a beaker. The empty beaker weighs 27.92 g and the beaker with the metal pieces weighs 66.53 g. These metal pieces are then added to a graduated cylinder containing 24.52 mL of water. The new volume in the graduated cylinder was read to be 29.80 mL. Show your work for all sections placing your answer on the line (with its units!).
a. What is the mass of the metal pieces alone?
b. What is the change in the volume in the graduated cylinder?
c. What is the volume of the metal pieces?
d. Calculate the density of the metal.
3. A small flask is fitted with a stopper. The empty flask with the stopper is weighed and the mass is 47.89 g. The flask is filled with water and reweighed giving a mass of 77.66 g. Given that the density of the water in the flask is 0.98975 g , calculate the volume of the flask. mL
4. A student used several pipettes to determine the density of an unknown liquid. The data is provided below. Calculate the density of the liquid in each trial. Show your work.
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trial #
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pipette volume
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masses
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density
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1
|
3.00 mL
|
empty flask = 52.01 g
flask + liquid = 55.50 g
mass of liquid =
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|
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2
|
5.00 mL
|
empty flask = 52.47 g flask + liquid = 58.34 g
mass of liquid =
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3
|
10.00 mL
|
empty flask = 52.35 g flask + liquid = 64.11 g
mass of liquid =
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Calculate also the average density of the liquid: