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C3 Chemistry > Analysis Substances > Flashcards

Analysis Substances Flashcards

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1
Q

Method for Flame test

metal ion test

A

Use a clean nichrome wire

Clean with acid

heat a salt in a blue flame an observe a colour flame.

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2
Q

Flame test colour for Lithium (Li+)

A

crimson flame

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3
Q

Flame test colour for Sodium (Na+)

A

yellow flame

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4
Q

Flame test colour for Potassium (K+)

A

lilac flame

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5
Q

Flame test colour for Calcium (Ca2+)

A

red flame

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6
Q

Flame test colour for Barium (Ba2+)

A

green flame.

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7
Q

Ion with a flame colour a crimson flame

A

Lithium (Li+)

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8
Q

Ion with a flame colour a yellow flame

A

Sodium (Na+)

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9
Q

Ion with a flame colour a lilac flame

A

Potassium (K+)

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10
Q

Ion with a flame colour a red flame

A

Calcium (Ca2+)

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11
Q

Ion with a flame colour a green flame.

A

Barium (Ba2+)

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12
Q

Describe a solution test for determining Metal ions

A

Add sodium hydroxide solution slowly at first then excess to a dissolved solutions of a salt (ionic compounds).

Colour of precipitate and dissolving determine the ion.

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13
Q

Observation when sodium hydroxide solution is added to a solution containing aluminium ions

A

a white precipitate which will dissolve on excess.

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14
Q

Observation when sodium hydroxide solution is added to a solution containing Calcium ions

A

white precipitate.

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15
Q

Observation when sodium hydroxide solution is added to a solution containing Magnesium ions

A

a white precipitate.

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16
Q

Observation when sodium hydroxide solution is added to a solution containing Copper(II) ions

A

a blue precipitate.

17
Q

Observation when sodium hydroxide solution is added to a solution containing Iron(II) (Fe2+) ions

A

a green precipitate.

18
Q

Observation when sodium hydroxide solution is added to a solution containing Iron(III) (Fe3+) ions

A

a brown precipitate

19
Q

Name and formula of ion when a white precipitate is formed and dissolves when excess sodium hydroxide is added to a solution.

A

aluminium ions (Al3+)

20
Q

Name and formula of ion when a white precipitate is formed when sodium hydroxide is added to a solution

A

Calcium ions (Ca2+) Or Magnesium ions (Mg2+)

21
Q

Name and formula of ion when a Blue precipitate is formed when sodium hydroxide is added to a solution

A

Copper(II) ions (Cu2+)

22
Q

Name and formula of ion when a green precipitate is formed when sodium hydroxide is added to a solution

A

Iron(II) (Fe2+) ions

23
Q

Name and formula of ion when a brown precipitate is formed when sodium hydroxide is added to a solution

A

Iron(III) (Fe3+) ions

24
Q

Test for carbonate ions?

A

Add acid

see fizzing

25
Q

Name of the ion in a solution if acid is added and fizzing is seen?

A

carbonate ion

26
Q

Test for sulfate ions?

A

Add Barium chloride OR Barium nitrate

white precipitate seen

27
Q

Test for Chloride ions

A

Add silver nitrate

White precipitate seen

28
Q

Test for Bromide ions

A

Add silver nitrate

Cream precipitate seen

29
Q

Test for Iodide ions

A

Add silver nitrate

Yellow precipitate seen

30
Q

Name of the ion in a solution if barium nitrate is added and a white precipitate is seen?

A

Sulfate ion

31
Q

Name of the ion in a solution if barium chloride is added and a white precipitate is seen?

A

Sulfate ion

32
Q

Name of the ion in a solution if silver nitrate is added and a white precipitate is seen?

A

chloride ion

33
Q

Name of the ion in a solution if silver nitrate is added and a cream precipitate is seen?

A

Bromide ion

34
Q

Name of the ion in a solution if silver nitrate is added and a Yellow precipitate is seen?

A

iodide ion

35
Q

Method for titration

A

Volumes of acid and alkali can be measured using a technique called titration using a suitable indicator.

Method to determine Concentration of Acid

  1. Fill a Burette with a known concentration of alkali (e.g 0.1 mol /dm3).
  2. Fill a conical flask with 25 cm3 of acid (unknown concnetration) using a pipette.
  3. Add a few drops of an indicator to the conical flask.
  4. Slowly add the alkali to the acid swirlling the solutions
  5. Stop adding alkali to the acid when the indicator preminantly changes colour.
  6. Record volume of alkali added.
  7. Use results to calculate concentration of alkali.

Visa versa for method to determine concnetration of alkali

C3 Chemistry (6 decks)

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