5.7 Neutralisation and the pH scale

Question 1

What are the acids?

Answer 1

Hydrochloric acid.
Sulfuric acid.
Ethanoic acid.
Citric acid.

Question 2

What the bases?

Answer 2

Alkalis: substances can neutralise acids.

Metal oxides + metal hydroxides are bases.

Question 3

Is pure water neutral?

Answer 3

Yes, as neither acidic nor alkaline.

Question 4

What is the position of substances in the universal indicator solution?

Answer 4

1=Hydrochloric acid.
2=Lemon juice.
3=Orange juice, vinegar.
5=Black coffee.
6=Rainwater.
7=Pure water.
8=Baking soda.
9=Milk of magnesia, soap.
12=Washing soda.
14=Oven cleaner, sodium hydroxide.

Question 5

What does the pH scale tell you?

Answer 5

How acidic or alkaline solution is.

Question 6

What is acidic, alkaline or neutral on the pH scale?

Answer 6

Acidic < 7.
Neutral=7.
Alkaline > 7.