Investigation: Does Salt Dissolve Faster In Hot Or Cold Water?

Question 1

What is the apparatus of the practical? (7)

Answer 1

3 beakers 
Table salt 
Very hot water(not boiling)
Very cold water
Tap water
Teaspoon 
Stopwatch/clock

Question 2

The method? (5)

Answer 2

1. ) Measure the same quantity(100ml) of tap water ,hot water and cold water respectively into the 3 containers.
2. ) Place one teaspoon (5ml) of salt into the container with the hot water.
3. ) Stir the solution by moving the teaspoon once back and forth through the water.
4. ) Measure it takes to dissolve completely. Record your time.
5. ) Repeat steps 3 and 4 with the tap water.

Question 3

What was the aim of the experiment?

Answer 3

To investigate how temperature affects the rates of dissolving.

Question 4

What did we compare in this experiment?

Answer 4

How temperature effects the rate of dissolving and does salt dissolve faster in hot or cold water.

Question 5

Name three things that were controlled variables? (3)

Answer 5

Amount of salt added 5 ml.
Amount of water each beaker had 100ml.
Amount of times we stirred the teaspoon once back and forth through the water in each beaker.

Question 6

What was the independent variable?

Answer 6

Temperature of the water.

Question 7

What was the dependent variable?

Answer 7

Time

Question 8

Why does the salt dissolve faster in the hot water?

Answer 8

Because the heat makes the water particles move faster, making more air pockets for the salt particles to fill, and then they dissolve quicker as their are more air pockets fro the salt particles to fill.