Dave

Density

Name : Prashanth Ashok Date:22/2/2012

Partner's Name : Marcus Lee
Lab Section : 6

Results and Discussion

Part A

| |Measured Weight (g) |Weight of water (g) |Density of water |
|Graduated Cylinder |62.33 |-- |-- |
|Graduated Cylinder + 10ml water |72.04 |72.04 - 62.33 = 9.71 |9.71g / 10ml = 0.971g/ml |
|Graduated Cylinder + 30ml water |91.94 |91.94 - 62.33 = 29.61 |29.61g / 30ml = 0.987g/ml |
|Graduated Cylinder + 50ml water |111.62 |111.62 - 62.33 = 49.29 |49.29 / 50ml = 0.986g/ml |

Calculate the slope of the graph - mass of water versus volume of water
= (49.29-14.95)/(50.0-15.00)
= 0.981
Compare and discuss the value of the slope with the calculated value for water density.
0.981 g/ml is the average density of water .Slope for graph is 0.981.The density of the water measured is correctly 0.981 g /ml,this is because the slope of the graph and density of water are the same.

Part B

Water displacement

Weight of the solid object = 9.99g

Initial water volume = 20.0 ml
Final water volume = 21.5 ml

Volume being displaced = Volume of the solid object = 1.5ml

What is the density of the object?
Density = 9.99g / 1.5 =6.66g / cm³

Part C
| |Volume (ml) |Measured Weight (g) |Weight of NaCl (g) |Density (g/ml) |
|Beaker |-- |109.21 | | |
|5% NaCl |10.0 |119.45 |10.24 |1.024 |
|10% NaCl |10.0 |120.27