Topic 8 (Acids and Bases)

 Topic 8

Task 1:

• What is pH?(potential of hydrogen)

• How do you measure pH?(Ph Meter)

• What is the scale pH is measured on?(Ph Scale)

• What pH level does water have? Is water acidic, basic, or neutral?(7)

• What is the most acidic pH level?(???)

• What is the most basic pH level?(14)

Acids and Bases.

• Ph- to measure acid and bases of solution

• Acid- Batteries, stomach acid,Vinegar,Medicines,

• Bases-Soap,detergent.

Streaky,slippery,bubbles, 

• Hydrogen ion

• Hydroxide ion

• Ph Scale 

• Nothing higher that 14

• Gastric Acid

• Citric Acid

• Batteries

• Lemon

• ToothPause

• Orange

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

Equipments

• Well plate

• litmus paper

• pH chart/table(1to14)

• Dropper

• Dropper

Products:

• Baking soda

• Distilled water

• Window cleaner

• Toilet bowl cleaner

• Lemon Juice

• Milk

• Orange Juice

• Apple Juice

• Vinegar

• Detergent

• Tea/Coffee

Substance	Acid/Base	Colour changes from?	Result.
Detergent	Based	Both colour stayed the same.	❌
Vinegar	acid	Different Colour	✔️
Lemon J	acid	Different Colour	✔
Apple J	Acid	Different Colour	✔️
Orange J	Acid	Different Colour	✔️
Window	Base	Both colour stayed the same.	❌
Toilet C	Acid	Different Colour	✔️
Mik	Based	Both colour stayed the same.	❌
Tea	Acid	Different Colour	❌
B C	Acid	Different Colour	✔️
Distilled water	b	Both colour stayed the same.

Red Litmus=Acid   

Blue Litmus=Base

Method

1. First of all, Using the marker, label each item you will be testing.

2. Measure about 4 or 5 drops of each item into the well plate and mark it for that item.

3. Take 10 different strips of litmus paper, so that you can test at least nine substances.

4. Take one small piece of red and blue litmus paper. Dip it into one of the substances to be tested. 

5. Repeat it with all other household substances.

6. Record all observations in a suitable table. Then dispose of the pieces of litmus paper in the waste bin.

7. Don’t forget to use a new test strip for each item. Discard the used strips.