STUDENT SPACE · TOPIC 2

Acid reactions and neutralisation

Predict products and write the acid–alkali ionic equation.

The essentials

Suitable reactive metals react with dilute HCl or dilute H₂SO₄ to give a salt and hydrogen.
Acid + metal oxide or hydroxide → salt + water. Acid + carbonate also produces CO₂.
H⁺ ions from the acid combine with OH⁻ ions from the alkali to form water.

Try each question before opening its hint or answer. Use paper for calculations and diagrams.

In NH₃ + H⁺ → NH₄⁺, explain why NH₃ acts as a base.

Need a hint for Question 1?

Identify metal, oxide, hydroxide or carbonate before choosing products.

Check Question 1

NH₃ accepts a proton.

Complete and balance: MgO + HCl → __ + __.

Need a hint for Question 2?

Acid plus basic oxide forms a salt and water.

Check Question 2

MgO(s) + 2HCl(aq) → MgCl₂(aq) + H₂O(l).

Name the gas from an acid with a carbonate, and give its test.

Need a hint for Question 3?

Identify the carbonate gas and the reagent used to detect it.

Check Question 3

Carbon dioxide; bubble it through limewater, which turns milky.

Use Lesson 2 in your worksheet for written practice. Your teacher will discuss those answers in class.