Technology/Topic 8 - Acids & Bases.

 Topic 8 - Acids & Bases

Background:

It is important that I understand the basics of pH before beginning this topic

1. What is pH? - pH is a measure of how acidic/basic water

2. How do you measure pH? - The pH can be measured using litmus paper or colorimeters

3. What is the scale pH is measured on? - 

Task 2 - Notes

Ph scale only goes up to 14 no more, 

1. Baking Soda. 

2. Cleaning Powders. 

3. Soap.

4. Toothpaste

5. Shampoo

1. yogurt

2. Vinegar

3. lemon juice

4. apples 

5. Orange

Aim: Test the pH levels in the different household products.

Products: 

Baking Soda

Distilled water

Toilet bowl cleaner

Lemon juice

Milk 

Orange juice

Apple Juice

Detergent

Tea/Coffee 

Vinegar.

Equipment:

Well plate

Litmus Paper 

pH chart/table 1 to 14

Dropper

Red Litmus Paper is Acid - 

Blue Litmus Paper is Base

Neutral - stays the same

Blue Litmus Paper put in acid turns red

Red Litmus Paper put in base turns blue

Substance	Acide/Base (Prediction)	Colour changes from? (Litmus paper is Blue )	Result (Acid/Base)
Detergent	Base	7	Neutral
Vinegar	Acide	1	Acid
Lemon Juice	Acide	1	Acid
Apple Juice	Acide	1	Acid
Orange Juice	Acide	1	Acid
Window cleaner	Base	14	Neutral
Toilet cleaner	Base	7	Base
Distilled Water	Neutral	7	Neutral
Milk	Neutral	7	Neutral
Tea	Neutral	3	Acid
Baking Soda	Neutral	12	Neutral

Method: 

Tested the Blue and Red Litmus paper in Acid, Base and Neutral liquids to see if the would changer colour or not and used the pH scale to see what colour they were so that we could tell if it was base, neutral or acid