Oxalate (C2O42-)

AIM: – To identify the given inorganic compound for its acidic and basic radical.

APPARATUS:- Chemical Reagent, Test Tube, Test Tube holder, Spatula

PROCEDURE:-

Preliminary Test:-

Experiment	Observation	Inference
Added dilute sulphuric acid to given salt.	No effect.	Carbonate, sulphide , sulphite, nitrate absent.
Added concentrated sulphuric acid to given salt.	Colourless gas with brisk effervescence evolved.	Oxalate may be present.

Confirmatory Test:-

Experiment	Observation	Inference
Passed the above evolved gas through lime water .	Lime water turned milky.	Oxalate confirmed.

Chemical Equations:-

C₂O₄^2-  + H₂SO_4(aq) ==> CO(g) + CO_2(g) + H₂O_(l) + SO₄^2-

CO_2(g) + Ca(OH)_2(aq) ==>CaCO_3(s)(milky) + H₂O_(l)

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