hAhEEE asked in 科學化學 · 8 years ago

chemistry :chloride ions test

Chemistry question:

chloride ion test:

1)add solution

2)then add silver nitrate solution

3) then add nitric acid

i know the result of chlorides is 'white precipitates appear' but

what is the result of chloride ions test when done on

1)sodium sulphate

2)potassium sulphate

3)sodium carbonate

4) potassium carbonate

please give the answer (result) respectively on each solution and silver nitrate solution and nitric acid.

thx.

Update:

今晚要,快快快~

1 Answer

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  • 8 years ago
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    1)

    The solubility of silver sulphate (0.31 g/100 mL water) is much higher than thatof silver chloride (0.00052 g/100 mL water at 50°C).

    When chloride ions test is done on sodium sulphate solution, there would be noobservable change and the solution remains clear (maybe slightly turbid whenthe reagent used is sufficiently concentrated).

    2)

    Similarly, w hen chloride ions test is done on sodium sulphate solution, therewould be no observable change and the solution remains clear (maybe slightlyturbid when the reagent used is sufficiently concentrated).

    3)

    In step 2, when silver nitrate solution is added, a yellow precipitate ofsilver carbonate is formed.

    Na2CO3(aq) + 2AgNO3(aq) → Ag2CO3(s) + 2NaNO3(aq)

    In step 3, when dilute nitric acid is added, the precipitate of silvercarbonate is dissolved to give a colourless solution of silver nitrate andcolourless bubbles of carbon dioxide are formed.

    Ag2CO3 + 2HNO3(aq) → 2AgNO3(aq) + H2O(l) + CO2(g)

    4)

    In step 2, when silver nitrate solution is added, a yellow precipitate ofsilver carbonate is formed.

    K2CO3(aq) + 2AgNO3(aq) → Ag2CO3(s) + 2KNO3(aq)

    In step 3, when dilute nitric acid is added, the precipitate of silvercarbonate is dissolved to give a colourless solution of silver nitrate andcolourless bubbles of carbon dioxide are formed.

    Ag2CO3 + 2HNO3(aq) → 2AgNO3(aq) + H2O(l) + CO2(g)

    2012-11-30 01:50:24 補充:

    Silver carbonate is a yellow solid, but not a white solid.

    The photo of silver carbonate solid :

    http://upload.wikimedia.org/wikipedia/commons/4/45...

    Source(s): sioieng, sioieng
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