Question

A researcher wants to test the solubility (property of being dissolved) of salt in water as the temperature of the water increases.

Design an experiment to test his hypothesis that as the water temperature increases the solubility of the salt in water also increases. Include the following in your experimental design: experimental setup, procedure for data collection methods and criteria for evaluating the hypothesis.



Materials: salt, water, beakers, heat source, thermometer, balance

Answer 1

To test the hypothesis that as the water temperature increases, the solubility of salt in water also increases, design an experiment using four beakers with water at different temperatures and measure the time it takes for the salt to dissolve. Evaluate the hypothesis by analyzing the data and looking for a trend.

Step-by-step explanation:

To test the hypothesis that as the water temperature increases, the solubility of salt in water also increases, you can design an experiment as follows:

1. Set up four beakers and label them A, B, C, and D.
2. Add the same amount of water to each beaker.
3. In beaker A, leave the water at room temperature.
4. In beaker B, heat the water to a low temperature (e.g. 30°C).
5. In beaker C, heat the water to a moderate temperature (e.g. 50°C).
6. In beaker D, heat the water to a high temperature (e.g. 70°C).
7. Add a measured amount of salt to each beaker and stir until the salt is dissolved.
8. Observe and record the time it takes for the salt to dissolve in each beaker.
9. Collect the data and compare the solubility of salt at different temperatures.

To evaluate the hypothesis, analyze the data and look for a trend. If the salt dissolves faster in the higher temperature beakers, then the hypothesis is supported. Additionally, you can calculate the solubility of salt in each beaker by dividing the mass of salt dissolved by the mass of water used.

Answer 2

Have about 5 beakers all with different temperatures of water. Put in a teaspoon of salt at a time and when it stops dissolving stop adding and record how much salt it took. It should be more salt as the temperature rises. The independent variable is the waters temperature. The dependent variable is how much salt is used. Make sure that there is the same amount of water in each beaker. Or else it won’t work.