Solubility Science Experiment

2.3 PLANNING A SOLUBILITY INVESTIGATION

CLASS 07

Multiple Choice

Solubility is defined as

• the ability to catch on fire

• the ability to be dissolved

• the ability to fly.

• the ability to get on Mrs. D's nerves.

Multiple Choice

In a sample of salt water, NaCl would be considered the ______.

• Solution

• Solvent

• Solute

• None of the above

Poll

Do you know the difference between accurate and reliable results ?

• Yes

• No

• Not sure

Accurate and Reliable Results

• Accurate result is how close final result is to accepted value. The closer it is more accurate your result is.

• When a scientist repeats an experiment with a different group of people or a different batch of the same chemicals and gets very similar results then those results are said to be reliable.

  
  

DISSOLVING SALT IN WATER

CLASS 07

Multiple Choice

Does temperature affects the solubility of solution?

• Yes

• No

Let us investigate how temperature affects the amount of salt that will dissolve in water.

Open Ended

Can you suggest how to investigate the hypothesis that temperature affects the amount of salt dissolved in water ?

Correct, To investigate you need to carry out experiment.

Count the number of spatulas of salt that will dissolve in 50 ml water. Repeat the experiment at different temperatures i.e. 20⁰ C, 40^o C, 60^oC, 80^oC.

Poll

Do you know what are variables?

• Yes

• No

Variables

Different parameters which can affect the experiment are called as Variables.

Multiple Choice

Which variable changes in your experiment?

• Water

• Temperature

• Sugar

• Nothing

Independent Variable

• The variable you change is called as Independent Variable.

• As there is constant change in temperature in your experiment, therefore it is an independent variable.

Multiple Choice

What are you suppose to count for your investigation?

• Amount of water required

• Temperature increases

• Number of spatulas of salt that will dissolve

• None of the above

Dependent Variable

• The variable which you measure is called as dependent variable.

• As in your investigation, you count spatulas of salt dissolved. Therefore, it becomes your dependent variable.

Multiple Choice

Which variable is kept same in your investigation ?

• Temperature

• Salt

• Water

• None of these

Control variable

• The variable which you keep the same, to ensure fair testing is called as Control variable.

• Throughout your investigation you kept quantity of water same. So, it becomes your control variable.

Multiple Select

I learnt following variables.

• Independent Variable

• Dependent Variable

• Control Variable

• I am not sure yet

Plot a graph

• The independent variable always goes along the horizontal axis.

• he dependent variable always goes up to vertical axis.

Poll

Now, I know how to plot a graph.

• Yes

• No

• Not Sure

Open Ended

What do you conclude from your investigation?