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  • Can someone explain - Theoretical Principles of Experimental Chemistry - BITSAT

Group V cations are precipitated in form of carbonates \left ( NH_{4} \right )_{2}.CO_{3}  why can we not use Na_{2} CO_{3} instead of \left ( NH_{4} \right )_{2}CO_{3}

  • Option 1)

    Because Na_{2}CO_{3} will precipitate MgCO_{3}

  • Option 2)

    Because Na_{2}CO_{3} in insoluble in water

  • Option 3)

    Because it is an ionic compound

  • Option 4)

    None of these

 

Answers (1)

best_answer

As we discussed in concept

Test of Carbonate ion -

Add BaCl_2  Solution which give white precipitate

Ba^{2+} + CO^{2-}_3 \rightarrow BaCO_3 \: (white)

- wherein

White ppt confirm the CO^{2-}_3 ions

 

 Na_{2}CO_{3} is highly ionised electrolyte, producing very high concentration of carbonic ions. Thus, precipitating MgCO_{3}

 


Option 1)

Because Na_{2}CO_{3} will precipitate MgCO_{3}

This option is correct.

Option 2)

Because Na_{2}CO_{3} in insoluble in water

This option is incorrect.

Option 3)

Because it is an ionic compound

This option is incorrect.

Option 4)

None of these

This option is incorrect.

Posted by

Aadil

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