Science Projects About Salt and Water Boiling

Written by jordan whitehouse
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Science Projects About Salt and Water Boiling
Will water boil at a higher temperature if you add salt? (Michael Blann/Digital Vision/Getty Images)

Science projects that test how salt effects the boiling point of water require few materials and are easy to set up. All you need is water, table salt, a cooking pot, a thermometer and measuring cups and spoons. Science projects about salt and boiling water are perfect for students in grades four to six.

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Procedure

The procedure for science projects about salt and boiling water is straightforward. Begin by boiling six cups of water and measure the temperature of the water when it boils. Use the highest temperature reading. Then measure a tablespoon of table salt, add it to the boiling water, stir the solution, and measure the temperature of the water. Record your highest temperature reading. Repeat this process using gradually more salt. Try measuring the temperature of the boiling water when using three, six and nine tablespoons of salt. Does the temperature of the boiling water increase or decrease when you add more salt?

Conclusions

You likely found that as you added more table salt to the boiling water, the water boiled at a higher temperature. You might also have noticed how important it is to keep the thermometer over the pot of boiling water when measuring temperatures because the heat from the stove can make your temperature readings higher. Display the data you recorded from the experiment in a bar graph to show your conclusions visually. On the y-axis display boiling temperature; on the x-axis display the amount of table salt added. The size of the bars should increase as you look from left to right.

Applications

Now that you've completed the experiment, can you think of any possible applications for it? Think about cooking methods and recipes that ask you to add salt to the water before you add a food like pasta. As you saw in the experiment, water boils at a higher temperature when you add salt. We also know that foods cook faster when they are boiled at higher temperatures. So one application is that when you add salt to boiling water, your foods will cook faster because the temperature of the water is higher.

Safety

Because these experiments use boiling water that can burn you, be very careful when you are around the stove and boiling water. Always complete these experiments in the accompaniment of an adult supervisor, and use heat-resistant gloves when dipping the thermometer into the water. Also make sure that you wear a long-sleeve shirt that tucks into or around your gloves; even if you don't touch the water, the steam that it gives off can still burn your wrists and arms.

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