C4.2.3 - Detecting Anions Flashcards

1
Q

What is formed when barium ions react with sulfate ions?

A

White insoluble barium sulfate

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2
Q

Describe how you would detect sulfate ions.

A

Add a few drops of hydrochloric acid to the solution, then a few drops of barium chloride. If the solution turns white, sulfate ions are present

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3
Q

Why does barium sulfate turn white?

A

A white precipitate is formed

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4
Q

What do hydrogen ions from dilute acids react with to form carbon dioxide and water?

A

Carbonate ions

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5
Q

Are most carbonates soluble?

A

No

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6
Q

Describe how you would detect carbonate ions.

A

Add a few drops of dilute hydrochloric/nitric acid to the solution, if it begins to bubble, carbonate ions are present. You can confirm the gas is carbon dioxide by bubbling it through limewater.

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7
Q

Describe how you would detect halide ions.

A

Add a few drops of nitric acid the solution, then add a few drops of silver nitrate solution. If the solution changes colour, a halide ion is present

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8
Q

What is the colour of the precipitate form if chloride ions are present?

A

white

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9
Q

What is the colour of the precipitate form if bromide ions are present?

A

cream

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10
Q

What is the colour of the precipitate form if iodide ions are present?

A

yellow

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