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1. Drag the empty jar to the lake to get a water sample  

2. Fill two beakers with 600 ml water from the jar

3. Put the “1” and “2” labels on each beaker  

4. Take the pH meter to Beaker 1 and record the pH and description in Table A  

5. Take the pH meter to Beaker 2 and record the pH and description in Table B

6. Add 1 unit of each base (soap, alkaline batteries, baking soda) to Beaker 2 and record the pH and description in Table B and clear

7. Add 1 unit of each acid (lead acid batteries, pesticides, citric acid) to Beaker 2 and record the pH and description in Table B and clear  

8.  Add 3 units of each kind of base or acid (the “pollutants”) to Beaker 2 and record the pH and description in Table A.

9. Get a new beaker and label it with a “3” and put the filter on the beaker

10. Add the polluted water from Beaker 2 to the filter on Beaker 3 and record the pH and description in Table A

11. Drag the rain clouds from the tools to the lake model and observe what happens to the rainwater and groundwater and record observations on Table C

12. Drag a lake to the model and observe the effects on the groundwater and record your observations on Table C

13.  Add 10 units of each pollutant to the lake  

14. Observe the changes in the lake water and the groundwater and record your observation in Table C

Explanation:

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

the ratio of the conjugate base to the acid required to attain the desired ph.