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chemistry > Tests for Ions > Flashcards

Tests for Ions Flashcards

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1
Q

Is magnesium sulphate soluble or insoluble?

A

soluble

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2
Q

Is magnesium chromate soluble or insoluble?

A

soluble

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3
Q

Is strontium sulphate soluble or insoluble?

A

insoluble

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4
Q

Is strontium chromate soluble or insoluble?

A

soluble

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5
Q

Is barium sulphate soluble or insoluble?

A

insoluble

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6
Q

Is barium chromate soluble or insoluble?

A

insoluble

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7
Q

Charge on NH4 ion

A

1+

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8
Q

Charge on OH ion

A

1-

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9
Q

Charge on NO3 ion

A

1-

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10
Q

Charge on HCO3 ion

A

1-

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11
Q

Charge on CO3 ion

A

2-

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12
Q

Charge on SO4 ion

A

2-

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13
Q

Charge on PO4 ion

A

3-

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14
Q

Describe the method for testing for group 2 metal ions

A
  • add metal chloride solution to test tube
  • add sodium hydroxide solution until in excess and swirl (ammonium solution or sulfuric acid can be used instead)
  • observe result
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15
Q

Result when magnesium chloride is mixed with ammonium solution

A

white precipitate
Mg(OH)2

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16
Q

Result when magnesium chloride is mixed with excess NaOH

A

white precipitate
Mg(OH)2

17
Q

Result when magnesium chloride is mixed with excess H2SO4

A

colourless solution

18
Q

Result when calcium chloride is mixed with ammonium solution

A

no change

19
Q

Result when calcium chloride is mixed with excess NaOH

A

white precipitate
Ca(OH)2

20
Q

Result when calcium chloride is mixed with sulfuric acid

A

slight white precipitate
CaSO4

21
Q

Result when strontium chloride is mixed with ammonium solution

A

no change

22
Q

Result when strontium chloride is mixed with excess NaOH

A

slight white precipitate
Sr(OH)2

23
Q

Result when strontium chloride is mixed with excess sulfuric acid

A

white precipitate
SrSO4

24
Q

Result when barium chloride is mixed with ammonium solution

A

no change

25
Q

Result when barium chloride is mixed with excess NaOH

A

no change

26
Q

Result when barium chloride is mixed with sulfuric acid

A

white precipitate
BaSO4

27
Q

Describe the method for testing for ammonium ions

A
  • 10 drops of solution containing ammonium ions
  • 10 drops of NaOH
  • swirl to mix
  • heat in water bath above bunsen
  • place red litmus paper near fumes
  • ammonia gas turns it blue (positive result)
28
Q

Describe the method to test for halide ions

A
  • add a small amount of nitric acid to the sample
  • add a small amount of silver nitrate to the sample too
29
Q

Describe the result you would see for chlorine ions after silver nitrate test

A

white precipitate that dissolves in dilute ammonia

30
Q

Describe the result you would see for bromine ions after silver nitrate test

A

cream precipitate that dissolves in conc ammonia

31
Q

Describe the result you would see for iodine ions after silver nitrate test

A

yellow precipitate that doesn’t dissolve in any conc of ammonia

32
Q

Describe how you would test for hydroxide ions

A
  • red litmus turns blue
  • pH using universal indicator is alkaline
33
Q

Describe the method for testing for carbonate ions

A
  • dilute HCl in test tube
  • equal volume of sodium carbonate
  • attach a bung with a delivery tube and put the delivery tube into a new test tube containing limewater
  • carbonate ions and hydrogen ions react to make carbon dioxide which turns limewater milky
34
Q

Describe how you would test for sulphate ions

A
  • acidify sample with dilute HCl
  • add a few drops of aqueous barium chloride
  • white precipitate forms if sulphate ions are present

chemistry (17 decks)

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