To measure the pH values of a range of skin and hair products
THE PLAN
Independent variable: the products
Dependent variable: pH value
Controlled variables-
1. Same amount of water measuring using a measuring cylinder.
2. Same indicator and amount of indicator (universal indicator).
3. Same amount of product
4. Same environment
5. Same person performing task
Name
Qty
Size
Risk
Precaution
Disposal
Test tubes
9
Small
Glass will break if dropped
Keep in a test tube rack
Wash and reuse
Test tube rack
1
Large
Knocked off bench
Keep away from edge of bench
Reuse
Distilled water
1
500mL
Squirting
Don’t squeeze unless in use
Pour down drain
Universal indicator
1
Dropper bottle
Flammable
Keep away from fire
Pour down drain
Creamy fresh peaches shampoo
1
500mL
Damage eyes
Avoid contact with eyes
Wash down drain
Seba med- face wash
1
200mL
Damage eyes
Avoid contact with eyes
Wash down drain
Nivea
1

Measuring cylinder
1
small

Spatula
1

The Report
Aim: To measure the pH values of a range of skin and hair products
Hypothesis: Seba med will be 5.5, Nivea visage will be 6, Creamy fresh peaches will be 6.5
Materials:
Name
Qty
Size
Risk
Precaution
Disposal
Test tubes
9
Small
Glass will break if dropped
Keep in a test tube rack
Wash and reuse
Test tube rack
1
Large
Knocked off bench
Keep away from edge of bench
Reuse
Distilled water
1
500mL
Squirting
Don’t squeeze unless in use
Pour down drain
Universal indicator
1
Dropper bottle
Flammable
Keep away from fire
Pour down drain
Creamy fresh peaches shampoo
1
500mL
Damage eyes
Avoid