Science- Example Criteria D

Research Question: (The question your experiment is going to be based on, should be a “How does (independent variable) affect (dependent variable?)

How does adding different amount of acid to a copper oxide affect the acidic level of the solution?

Independent Variable: (This is the variable that you are going to change in the experiment, should have 5 different variations of this variable)

The amount of hydrochloric acid going to be added into the copper oxide solution (10ml, 15ml, 20ml, 25ml, 30ml).

 

Dependent Variable: (This is the variable that you are going to measure in the experiment)

The acidic level of the solution measured using a pH probe in molar.

Controlled Variable: (The variables that you are going to keep the same so your experiment doesn’t become unfair, also state how you are going to control this variable in the experiment, you should have at least 3 controlled variables)

  • The type of acid– The acid will be kept the same because different type of acids would have a different molar level. The acid we will use would be hydrochloric acid (0.1ml).
  • The amount of copper oxide– The amount of copper oxide will be kept the same at 5 grams because if the amount changes then the acidic level can also change.
  • The temperature of the solution– The temperature is important to keep the same because it can directly affect how fast and when the reaction would appear, this is why the test would be conducted in room temperature.

Hypothesis: (This is where you predict with scientific proof what you would think would happen in your experiment, use “I think that as you change (IV) the effect on the (DV) will be…”, include in-text citation and if a diagram helps explain, then include one or even a sketch graph)

We predict that as you raise the level of acid the effect on the acidic level would be more neutralized because adding acid to the copper oxide would make the solution much more neutralized.

Apparatus/ Equipment: (This is where you list the equipment or materials you need, include quantities and sizes)

Material/ Equipment

Amount/ quantity needed

Beaker

1

Test tube

5

Measuring Cylinder

1

Spatula

1

Hydrochloric acid

200ml

Copper oxide

100grams

pH probe

1

Method: (Your method should be in steps and it should be very detailed, from ¾ to a whole page. Instructional language would be appropriate here, also state how you are going to control your controlled variables)

  1. Measure out 10ml of hydrochloric acid and place it in a test tube.
  2. Using the pH probe measure the acidic level of the acid.
  3. Measure out 5 grams of copper oxide.
  4. Place the copper oxide into the test tube with the acid, stir until crystals are formed.
  5. Use the pH probe to measure out the final acidic level of the acid.
  6. Repeat steps 1 to 5 for another 4 times, record all data in the results table below.
  7. Measure out 15ml of hydrochloric acid and place it in a test tube.
  8. Repeat steps 2 to 5 for 5 times; making sure its 15ml of acid not 10ml, record all data in the results table below.
  9. Measure out 20 ml of hydrochloric acid and place it in a test tube.
  10. Repeat steps 2 to 5 for 5 times; making sure its 20ml of acid not 15ml, record all data in the results table below.
  11. Measure out 25 ml of hydrochloric acid and place it in a test tube.
  12. Repeat steps 2 to 5 for 5 times; making sure its 25ml of acid not 20ml, record all data in the results table below.
  13. Measure out 30 ml of hydrochloric acid and place it in a test tube.
  14. Repeat steps 2 to 5 for 5 times; making sure its 30ml of acid not 25ml, record all data in the results table below.

Results Table

Amount of HCl (ml)

Trials (ml)

1

2

3

4

5

10
15
20
25
30
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