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A level Chemistry AQA > Test for ions > Flashcards

Test for ions Flashcards

1
Q

How do you test for Magnesium ions?

A

excess NaOH - White ppt

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2
Q

Ca2+

A

excess NaOH - Slight white ppt

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3
Q

Ba2+

A

excess sulfuric acid - white ppt

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4
Q

Write the equation for the test for Mg2+. Ca2+. Ba2+

A
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5
Q

NH4+

A

Warm with NaOH and test gas with damp red litmus - turns blue

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6
Q

Write the equation for the test for NH4+

A
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7
Q

Ag+

A

Sodium chloride - white precipitate

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8
Q

Write the half equation for the test for Ag+

A
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9
Q

H+

A

Soluble carbonate or hydrogencarbonate - effervescence

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10
Q

Write the equation for the test for H+

A
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11
Q

CO32-

A

hydrochloric acid = effervescent

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12
Q

What is the equation for the test for carbonate ions

A
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13
Q

OH-

A

MgCl2 - white ppt OR NH4Cl and warm - test gas with damp red litmus - turns blue

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14
Q

What is the equation for the test of OH-

A
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15
Q

What is the reaction between halide ions and silver nitrates used for?

A

to discover which halide ion is present

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16
Q

Describe how to carry out the reaction of halide ions with silver nitrate and how to carry out the subsequent tests used to distinguish them further

A

make the test solution by adding nitric acid to the sample and then adding silver nitrate solution dropwise

Subsequent tests: add some dilute ammonia solution dropwise until it is excess. After add concentrated ammonia solution dropwise until it is excess

17
Q

Describe the results seen when halide ions react with silver nitrate

A

Fluorides produce no precipitate

Chlorides produce a white precipitate

Bromides produce cream precipitate

Iodides produce a pale yellow precipitate

18
Q

What is the test for sulfate ions?

A

adding barium chloride acidified with hydrochloric acid/ nitric acid to a solution containing sulfate ions, then a white precipitate of barium sulfate is formed

19
Q

Describe the results seen when halide ions react with dilute ammonia and concentrated ammonia

A

Florine= nothing

Chlorine = white precipitate dissolves, goes clear (soluble) in both

Bromide= insoluble in one, cream precipitate dissolves in concentrated ammonia (goes clear)

Iodine= insoluble in both

20
Q

Write the ionic equation for the test for sulfate ions

21
Q

Write the ionic equation for when there are carbonates present during a test for sulfates

A

2H+ CO32- → H2O +CO2

A level Chemistry AQA (30 decks)

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