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In Course: GCSE Chemistry (AQA): Paper 2

AQA GCSE Chemistry: Identifying Anions and Precipitates

Covers chemical tests for metal cations using sodium hydroxide to form precipitates, and tests for anions including carbonates, halides, and sulfates. Includes the required practical on using these tests to identify the ions in an unknown single ionic compound.

Dramatic close-up, wide-angle photograph of a gloved hand carefully adding drops from a pipette into a glass beaker, causing a vibrant, swirling blue precipitate to instantly form and diffuse through the clear liquid. In the slightly blurred background, other beakers show distinct green and brown precipitates, all bathed in bright, focused laboratory light.

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Deck Contents

35 Cards
Lesson#1
In this deck, we'll explore how chemists identify unknown ions in a solution. This is a key part of chemical analysis and a required practical for your GCSE. We'll learn a series of chemical tests that produce distinctive results, often forming a solid called a precipitate, which can tell us which ions are present.
Quiz#2
What is the term for an insoluble solid that forms when two solutions are mixed?

a precipitate

Lesson#3
First, let's look at how to identify positive metal ions, also known as cations. A common method is to add a few drops of sodium hydroxide solution. Many metal ions react with hydroxide ions to form insoluble precipitates of a specific colour.
Quiz#4
What chemical is commonly added to a solution to test for many positive metal ions?

sodium hydroxide solution

Lesson#5
If you add sodium hydroxide solution and a blue precipitate forms, this indicates the presence of copper two ions. The precipitate is copper two hydroxide.
Quiz#6
When testing for metal ions with sodium hydroxide, what colour precipitate indicates the presence of copper two ions?

blue

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