Name: ________________________
Date: ___________________
Lab Report – Grade 7 Science
Pure Substances and Mixtures
Name of Experiment: _________________________________________
Testable Question:
Hypothesis: (Prediction)
Equipment Used:
1. Test tubes
2. Stoppers
3. Measuring spoons
4. Cold water, room temperature water and hot water
5. Empson salts
Procedure:
Controlled variables: __________________________________________________
Independent variable: _________________
Dependent variable: _____________________
1. Have one member of the group time for agitation to make sure the solution is agitated
(shaken) for 1 minute each time.
2. Pour 5ml of salt in each of the water tubes and agitate for set time.
3. Record both your quantitative and qualitative observations in the chart each time more
salt is added.
4. Repeat, carefully recording how much salt is added to each tube before it stops
dissolving.
5. When the salt is no longer dissolving the solution has reached its saturation point.
6. Carefully measure the amount of saturated solution before you pour down the sink.
Data and Observation: (Present your observations in a form that is easily understood. Record in tables with
units of measurement and qualitative observations.)
Amount of solute
Cold Water:
5 g (1 teaspoon)
Qualitative Observations
10 g (2 teaspoons)
15 g (3 teaspoons)
Quantity of saturated solution at
end of experiment: _________
Hot Water:
Quantity of saturated solution at
end of experiment: _________
Quantitative Observations
Analysis and Evaluation:
The amount of salt added up to the point of saturation can be used to calculate the concentration of salt in the
solution. Calculate the concentration for the solutions you made at each temperature:
Concentration of cold solution:
Concentration of warm solution:
Evaluate: Write a conclusion of your experiment and indicate whether or not your results support your
hypothesis or prediction. Add a reflection: How did the experiment go? Could you have done things better?
Other notes or questions: