lesson: acids and bases. science differentiation in action all acids have a sour taste. carbonic...

Lesson: Acids and Bases

Science Differentiation in action

All acids have a sour taste.

Carbonic acid Citric acid


Some acids are corrosive.

(H2SO4) (HCl)

What elements are contained in these acids?

Sulfuric acid. Hydrochloric acid.


Which hazard symbol represents corrosive?

A B C


How would we test for an acid?

Try some experiments.

Use litmus paper.

What did you find out?

Acids turn blue litmus paper ____red.


Bases are the opposite of acids.

Toothpaste Soap Cleaning agents


Strong bases include:

What elements are contained in these bases?

(NaOH) Ca(OH)2

Sodium hydroxide Calcium hydroxide


Strong bases include:

Sodium hydroxide is also called caustic soda because it is

corrosive.

Calcium hydroxide is also called limewater.

NON-CORROSIVE


Bases that dissolve in water are called:

So ______ are bases soluble in water.alkalis

Alkalis


How would we test for a base or an alkali?

Try some experiments.

Use litmus paper.

What did you find out?

Alkali turn red litmus paper ____.blue


The strength of acids and bases can be measured on a pH scale.

Each colour represents a number on the pH scale.

Strong acid

Weak acid

Weak base

Strong base

1 3 5 7 9 11

12 14

pH 7 is neutral.It is not an acid or a

base.



We can measure pH using universal indicator.

Strong acid

Weak acid

Weak base

Strong base

1 3 5 7 9 11

12 14

pH 7 is neutral.It is not an acid or a base.



Now, use universal indicator to find the pH of some substances.

Strong acid

Weak acid

Weak base

Strong base

1 3 5 7 9 11

12 14


1. What acid is found in your stomach?

Review Questions

2. Which pH is neutral?

3. What would you use to measure pH?

1 3 5 7 9 11

12 14


What happens when you add an acid to a base?

Question to think about!

lesson: acids and bases. science differentiation in action all acids have a sour taste. carbonic...

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