Acids and alkalis

Question 1

0-6 on the pH scale

Answer 1

Acids (light green to dark red)

Question 2

7 on the pH scale

Answer 2

Neutral (green)

Question 3

8-14 on the pH scale

Answer 3

Alkali (light blue to dark blue/purple)

Question 4

What is a base

Answer 4

any substance that reacts with an acid to form a salt and water only

Question 5

Explain why all alkalis are bases, but not all bases are alkalis.

Answer 5

Alkalis are soluble bases, but only some bases are soluble in water, so these are not alkalis.

Question 6

Example of an insoluble base

Answer 6

Copper oxide

Question 7

Which two substances are alkali bases

Answer 7

Metal oxides and metal hydroxides