Read the passage about Mr. Ellis.

Question

Mr. Ellis is showing his science class how salt dissolves in water. He pours 500 mL of water into a saucepan. He turns on the burner to a medium heat for 5 minutes. He adds 30 grams of salt to the water, starts a timer, and stirs gently for 2 minutes. He records how long it takes for the salt to dissolve.
Mr. Ellis wants to slow the speed of the salt dissolving. Which change to his method would most likely help him to do this?

Answer 1

To slow the speed at which the salt dissolves in water, Mr. Ellis could make a few adjustments to his method. The most effective change would be to lower the temperature of the water. By using colder water instead of warm or hot water, the rate of dissolution will decrease. Additionally, he could also reduce the amount of salt added, increase the size of the salt particles (using coarser salt), or stir less vigorously. However, lowering the temperature of the water is likely the most significant change that would help achieve his goal effectively.