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General Chemistry Science Fair Project

Temperature and Dissolving Power

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Temperature and Dissolving Power | Science Fair Projects | STEM Projects
How does heating water change how much you can dissolve in it? You measure out 100 ml of water at 20 degrees Celsius and add sugar a little at a time until no more dissolves. Then you heat the water to 40 degrees and keep adding. You repeat at 60, 80, and 100 degrees. You run the same test with salt and baking soda. All three substances dissolve more as the water gets hotter. Sugar shows the biggest jump, going from 240 grams at 20 degrees to 480 grams at 100 degrees.

Hypothesis

The hypothesis is that as the temperature of the water increases, the amount of substance dissolved in the water also increases.

Method & Materials

You will measure the temperature of the water, add different substances to the water, and measure the amount of substance dissolved in the water.
You will need 3 beakers, 300ml of water, some ice cubes, a measuring cylinder, a hot plate, a thermometer, 1kg of sugar, 100g of salt, 100g of sodium bicarbonate, a digital weighing scale, and a spatula.

Results

The results show that as the temperature of the water increases, the amount of sugar, salt, and sodium bicarbonate dissolving in the solution is also higher. This proves that the hypothesis is true.

Why do this project?

This science project is interesting because it shows how temperature affects the solubility of different substances in water.

Also Consider

Consider repeating the experiment with other substances like calcium chloride, potassium permanganate, or iron sulfate. You could also repeat the experiment using different solvents like alcohol or benzene.

Full project details

Additional information and source material for this project are available below.

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