10 Chem Copy Of Dang Lab Report

Melinda Dang 2nd Period Exploring the Affects of Solution Concentration on Solution Density Question How does the concentration of a sugar solution affect its density? Hypothesis If we increase the concentration of the sugar solution, then density will also increase because as we create a higher concentration in the sugar solution, the mass of the sugar solution increases as the volume of the sugar solution stays the same. Density is found by dividing mass by volume. The density will also increase because the mass is greater than the volume. Experimental Design Control Group

Experimental Group 1

Experimental Group 2

Experimental Group 3

Experimental Group 4

No sugar 100 mL water

2g Sugar 98 mL of Water

4g Sugar 96mL of Water

6g Sugar 92mL of Water

8g Sugar 92mL of Water

MV: Amount of sugar and concentration of each solution RV: Density of each sugar solution CV: The amount of solution in mL ECC: 100 mL solution with no sugar added Trials: Once Procedure 1. Take out one 250 mL beaker and weigh the beaker on scale. 2. Pour 10g of sugar into 90 mL of water into beaker so that solution is always equal to 100mL. 3. Weigh solution and subtract weight of beaker and record mass in grams. 4. Find density of 10g solution and record on data table. 5. Pour 8 g of sugar into 92 mL of water into beaker. (100mL) 6. Weigh solution and subtract weight of beaker and record mass in grams. 7. Find density of 8g solution and record on data table. 8. Pour 6g of sugar into 94mL of water. 9. Repeat steps 3 and 4. 10. Pour 4g of sugar into 96mL of water. 11. Repeat steps 3 & 4. 12. Pour 2g of sugar into 98mL.

13. Repeat steps 3 and 4. 14. Repeat entire procedure to ensure validity of results. Data and Observations Final Weight (g) 104 103 102 98 97

Solution(mL) 250 250 250 250 250

Grams of Sugar 10 8 6 4 2

Density(g/mL) 0.416 0.412 0.408 0.392 0.388

Density(g/mL) 0.416 0.412 0.408 0.392 0.388

Density of Sugar Solutions(g/mL) 0.42 0.415 Density(g/mL)

Grams of Sugar 10 8 6 4 2

0.41 0.405 0.4 0.395 0.39 0.385 0

2

4

6

8

10

Concentration of Sugar in Solution (Grams)

12

As the concentration of sugar in the solution (grams) increases, the density (g/mL) of the solution increases also. This is a direct variation. Interpretation and Conclusion In conclusion, my hypothesis was correct. As the concentration of sugar solution increases, the density of the solution also increase. My data proves this because at the lowest data point of 2g of sugar solution, the solution has a density of .378 g/mL. Then at my highest data point of 10g of sugar solution, the solution has a density of .417g/mL. Since my responding variable increase as my manipulated increases, this is proof of a direct variation. Direct variation is related to everyday life because in many cases, when we change one thing, we will change another. For example, if we don’t eat, we will lose weight. One source of error could be that the sugar in each solution was not fully dissolved, this would change the outcome of the experiment because the not dissolved sugar would decrease the overall solution density. Another error that could’ve occurred are mathematical errors during our density calculation processes. Miscalculations could lead to inaccurate data and change the experiment.