What is a false positive?

How can you prevent false positives?

What is the test for carbonates?

Give the half equation for the test for carbonates

What is the test for carbon dioxide?

TRUE OR FALSE
All sulphates are soluble in water

Describe the method for the sulphate test

If the sulphate test is positive, a white precipitate will be formed. What is this precipitate?

Give the half equation for the formation of barium sulphate in the sulphate test

Complete the sentences:
In the test for sulphates, a false positive may occur due to ____________ or ____________ ions. In the test for carbonates, you add a ________ strong acid which will react with any carbonates or sulphites present so that they won't interfere with the test.

What is the test for halides?

If the test for halides is positive, a precipitate is formed. The colour of the precipitate determines the halide present. What are the colours of silver chloride, silver bromide or silver iodide?

TRUE OR FALSE:
Ammonia gas is acidic

What is the test for ammonia?

Outline the method used to test whether a substance contains ammonium ions (NH₄⁺)

Give the half equation for the reaction between ammonium ions and hydroxide ions