Progress 4 - Project decided (=

Research: The time it requires for water to dissolve a certain amount of salt

Independent variable:

• The amount of salt - 5g, 10g, 15g, 20g, 25g

Controlled variables:

• Amount of water (100 mL)
• Environment - shaded area to prevent the sun evaporating the water

To determine when the salt is completely dissolved:

• When the researcher (THATS ME) and another witness (probably my sister) agree that the salt has completely dissolved.

OR

• When there isn't a trace of salt left in the container .. if the other witness is not available to help