Testing for ions- Cations

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Test your testing for cation knowledge. If you need to recap the practical watch:

Pearson Edexcel (9-1) GCSE Chemistry Core Practical - testing for cations and anions - YouTube

In a flame test, a red colour is seen. Give the formula of the cation which is present.

1 point

K⁺

Na⁺

Cu²⁺

Li⁺

Clear selection

What is the test for NH₄⁺ ions and what is the result?

1 point

Add silver nitrate, and a white precipitate forms

Add NaOH and gently heat. The gas (ammonia) turns damp red litmus paper blue

Gently heat. The gas (ammonia) bleaches damp red litmus paper

Add NaOH and gently heat. The gas (ammonia) turns damp blue litmus paper red

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Describe how you would carry out a flame test

1 point

Dissolve solid in acid. Put solution onto a clean wire. Put into an blue flame

Dissolve solid in acid. Put solution onto a clean wire. Put into a blue flame

Put solid onto a clean wire. Put into an orange flame

Put solid onto a clean wire. Put into a blue flame

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Give the name of the green precipitate formed when sodium hydroxide is added to a solution containing Fe²⁺

1 point

iron (III) oxide

iron (II) hydroxide

iron (III) hydroxide

iron (II) oxide

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In a flame test, a yellow colour is seen. Give the formula of the cation which is present.

Ca²⁺

K⁺

Li⁺

Na⁺

1 point

Ca²⁺

K⁺

Li⁺

Na⁺

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Write a word equation for the reaction between sodium hydroxide and iron(II) sulfate:

1 point

sodium hydroxide + iron(II) sulfate → sodium hydroxide + iron (II) sulfate

sodium hydroxide + iron(II) sulfate → iron (II) hydroxide + sodium sulfate

sodium hydroxide + iron (II) sulfate → iron (II) hydroxide + sodium sulfite

sodium hydroxide + iron(II) sulfate → iron (III) hydroxide + sodium sulfite

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How are calcium ions identified, and what is the result?

1 point

Using sodium hydroxide. Precipitate is blue

Using a flame test. Flame colour is yellow

Using a flame test. Flame colour is orange- red

Using sodium hydroxide. Precipitate is green

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Sodium hydroxide solution was added to a solution, a blue precipitate formed. Which ion was present in the solution?

Copper ion, Cu2+

Iron(II) ion, Fe2+

Calcium ion, Ca2+

1 point

Copper ion, Cu2+

Iron(II) ion, Fe2+

Calcium ion, Ca2+

Iron (III), Fe 3+

Clear selection

A colourless solution was tested with a few drops of sodium hydroxide. A white precipitate formed. When excess sodium hydroxide was added, the white precipitate redissolved. Which ion was present?

1 point

Calcium ion, Ca2+

Aluminium ion, Al3+

Iron (II) ion, Fe2+

Copper ion, Cu2+

Clear selection

If a brown precipitate forms when sodium hydroxide is added to a mystery solution, which metal ion was present?

1 point

Sodium ion, Na+

Iron(III) ion, Fe3+

Potassium ion, K+

Iron(II) ion, Fe2+

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