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Chemistry 9 > Idm > Flashcards

Idm Flashcards

1
Q

What is a precipitate

A

An insoluble solid suspended in a liquid

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2
Q

Without using the flame test how can you test for aqueous metal ions

A

Add sodium hydroxide solution to the metal ions observe the colour of the precipitate

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3
Q

What colour precipitate form when sodium hydroxide reacts with calcium ions

A

White

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4
Q

What colour precipitate forms when sodium hydroxide reacts with copper ions

A

Blue

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5
Q

What colour precipitate forms when sodium hydroxide reacts with iron(II) ions

A

Green

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6
Q

What colour precipitate forms when sodium reacts with iron(III) ions

A

Brown

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7
Q

What colour precipitate forms when sodium hydroxide reacts with aluminium ions

A

White initially
With excess NaOH the precipitate redissolves to form colourless solution

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8
Q

What is observed when sodium hydroxide reacts with ammonium gas

A

A pungent gas is produced NH3 which will turn damn red litmus paper blue

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9
Q

How could you distinguish between two solutions containing aluminium ions and calcium ions

A

Add excess sodium hydroxide
Both will form white precipitate initially
Precipitate formed from aluminium ions will re dissolve to form a colourless solution

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10
Q

How can you test for carbonate ions

A

Add a few drops HCL to sample
Connect this test tube to a test tube of limewater
If carbonate ions present they will react with acid to produce CO2 which will turn limewater cloudy when it’s bubbled through limewater

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11
Q

Write chemical reaction between HCL and Na2CO3

A

Na2CO3 + 2HCL = CO2 + 2NaCl + H2O

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12
Q

How can you test for sulfate ions

A

Add HCL to remove any CO3-2 ions as they will obscure result
Add a couple of drops of barium chloride
If sulfate ions are present a white precipitate of barium sulfate will form

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13
Q

Write the chemical equation for the reaction between BaCl2 and MgSO4

A

BaCl2 + MgSO4 - BaSO4 + MgCl2

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14
Q

How do you carry out test for halide ions

A

Add a few drops of nitric acid to react wjrh any carbonate ions which might obscure results
Add couple drops of silver nitrate
Observe the colour of precipitate

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15
Q

What colour precipitate is formed when silver nitrate is added to a chloride solution

A

White precipitate or silver chloride

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16
Q

What colour precipitate is formed when silver nitrate is added to bromide solution

A

Cream precipitate of silver bromide

17
Q

What colour precipitate is formed when silver nitrate is added to an iodide solution

A

Yellow precipitate of silver iodide

18
Q

Benefits of using instrumental methods for analysis

A

Accurate
Sensitive
Quick to carry out

Chemistry 9 (7 decks)

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