MEDIUM
Lower Secondary Stage 9
IMPORTANT
Earn 100

Dilute hydrochloric acid is classified as 'low hazard'. Describe a safety precaution you should always take when using dilute acids.

Important Questions on Preparing Salts

HARD
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 6 - Preparing Salts>Exercise 1>Q 7
Explain why some salts have large crystals, while others have small crystals.
EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 6 - Preparing Salts>Exercise 2>Q 1
Which word equation describes the reaction between acid and a carbonate?
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 6 - Preparing Salts>Exercise 2>Q 3

Describe how pH changes as sodium carbonate are added to some sulphuric acid.

At the start of the reaction, the pH is _____ because there is only sulphuric acid in the beaker. When all sulphuric acid has reacted, th pH is ____ because the ____ and water are neutral. If more sodium carbonate is added the pH will _____ until it reaches 10 or 11.

MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 6 - Preparing Salts>Exercise 2>Q 4
What would you expect the pH of copper chloride solution to be? Give a reason for your answer.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 6 - Preparing Salts>Exercise 2>Q 5

Hassan was making potassium sulphate by adding potassium carbonate powder to some sulphuric acid. During the final stages of reaction, the potassium carbonate did not fizz when it was added. When Hassan measured the pH he found it was 10.5.

Explain his result.

EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 6 - Preparing Salts>Test-style questions>Q 1

Salts can be prepared by the reaction of acids with metals.

Complete the equation:

Acid + metal →salt + _____

MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 6 - Preparing Salts>Test-style questions>Q 1

Salts can be prepared by the reaction of acids with metals.

Choose the word that best describes the reaction.

EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 6 - Preparing Salts>Test-style questions>Q 1

Sodium sulphate is an important salt used to make detergents.

The table lists some substances. Tick the name of the acid used to make detergents.

Hydrochloric acid  
Sulphuric acid  
Noitric acid