Starter: Here are the answers. What were the questions?

1. Acid

2. Alkali

3. Neutral

4. Irritant

5. Red litmus

6. Blue litmus

Starter

• Re-arrange the method for making your own indicator

• Cut out the steps and stick them into your book in the correct order

Which Vegetable Makes the Best Indicator?

Objectives:To plan an investigation into using vegetables as

indicatorsOutcomes: Lvl 5 –

I can identify significant variables in investigations & select which to investigate.

I can describe a clear method for my investigation.

I can explain why certain pieces of equipment are more appropriate than others.

Hypothesis

• An idea that has yet to be tested

The colour of the vegetable changes how good it is at being an indicator of acids and

alkalis

Independent Variable

• The thing we are changing in our investigation

My independent variable is…

The Vegetables Used

Dependent Variable

• The thing we are changing in our measuring

My dependent variable is…

Control Variables

• The things we are keeping the same

My control variables are…

Equipment

• Make a list of the equipment you used using the equipment wall

• What was each piece used for?

The equipment I will need:

Which Vegetable Makes the Best Indicator?

Objectives:To plan an investigation into using vegetables as

indicatorsOutcomes: Lvl 5 –

I can identify significant variables in investigations & select which to investigate.

I can describe a clear method for my investigation.

I can explain why certain pieces of equipment are more appropriate than others.

Method

• On the next slide is the method used for making red cabbage indicator

water

Step 1 Chop up the cabbage.

Step 5 Carefully pour the dye solution into a bottle for storage. This can now be used as an indicator.

cabbageconical flask

Step 2 Put the cabbage into a conical flask.

Step 3 Half - fill the conical flask with water.

Step 4 On a tripod and gauze, boil the mixture for 4 minutes. Next, allow the apparatus to cool down.

gauze

heat

dye solution

tripod

bottle

dye solution

Making an indicator from cabbage

Method

• Cut out the steps of the method and stick them into your book in the correct order

Which Vegetable Makes the Best Indicator?

Objectives:To plan an investigation into using vegetables as

indicatorsOutcomes: Lvl 5 –

I can identify significant variables in investigations & select which to investigate.

I can describe a clear method for my investigation.

I can explain why certain pieces of equipment are more appropriate than others.

Risk AssessmentHazard Risk Control Measure

Bunsen Burner

Hot Water

Breaking a test beaker

Results Table