Chapter 4 Acids and Redox

Question 1

What is an acid

Answer 1

a substance that donates protons (H+) when dissolved in water

Question 2

Difference between strong and weak acids

Answer 2

a strong acid completely dissociates in aqueous solution. whereas a weak acid partially dissociates in aqueous solutions.

Question 3

What is a base?

Answer 3

A base neutralises an acid to form a salt

Question 4

What is an alkali?

Answer 4

a base that dissolves in water releasing hydroxide ions into the solution.

Question 5

What is neutralisation

Answer 5

In neutralisation an acid, H+ ions react with a base to form a salt and neutral water. The H+ ions from the acid are replaced by metal or ammonium ions from the base.

Question 6

Neutralisation of acids with metal oxides and hydroxides

Answer 6

acid + alkali = salt + water.
ionic equation
H+ + OH- = H2O

Question 7

Neutralisation of acids with carbonates

Answer 7

Acids + metal carbonate = Salt + Water + CO2.

Question 8

What is a titration? and what can they be used for?

Answer 8

is a technique used to accurately measure the volume of one solution that reacts exactly with another solution.
They can used for finding the concentration of a solution, identifying unknown chemicals, finding purity of a substance.