11: Making salts- 1

Question 1

What determines the pH of acids?

Answer 1

Acids dissolve in water to produce acidic solutions, They contain hydrogen ions, H+. The concentration od these ions determines the pH of an acid. The higher the concentration of hydrogen ions, the more strongly acidic the solution is, and the lower it pH.

Question 2

What pH is neutral?

Answer 2

7

Question 3

What pH range is acidic?

Answer 3

1-6

Question 4

What pH range is alkaline?

Answer 4

8-14

Question 5

What is an indicator?

Answer 5

a substance that changes colour depending on whether it is an acidic solution or alkaline solution

Question 6

Examples of indicators

Answer 6

Bromine water
Universal indicator
Litmus paper

Question 7

What is a base?

Answer 7

a substance that can neutralise an acid

Question 8

What is the reaction between a base and an acid called?

Answer 8

Neutralisation

Question 9

If the base is soluble in water, is it an alkali or acid?

Answer 9

Alkali

Question 10

Equation for neutralisation

Answer 10

acid + base = a salt + water

Question 11

What type of ions do alkaline and acidic solutions produce?

Answer 11

Acidic solutions produce hydrogen ions, H+.

Alkaline solutions produce hydroxide ions, OH-

Question 12

Ionic equation for neutralisation

Answer 12

H+ + OH- = H2O