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Why is sodium carbonate extract acidifie...

Why is sodium carbonate extract acidified before perfoming the confirmatory tests for anions?

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Sodium carbonate extract in addition to the sodium salts of anions contain carbonate also. On heating with the test reagent carbonates of certain metals precipitate which interfere in the detection of acid redicals. Because of this, `Na_(2)CO_(3)` is decomposed by adding `HCl, HNO_(3), H_(2)SO_(4)`, depending upon the nature of test.
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RESONANCE ENGLISH-QUALITATIVE ANALYSIS (ANION)-Exercise-1
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  2. colourless salt (A) underset(740^(@)C) overset(Delta)to (B) +(C ) over...

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  3. Why is sodium carbonate extract acidified before perfoming the confirm...

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  4. Can sodium carbonate extract be used test for CO(3)^(2-) ions?

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  5. What will happen if to a solution of Ca(HCO(3))(2) formed by passing t...

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  6. What will happen if bromine water is added in a white precipitate of B...

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  7. Salt (A) + lime water to white precipitate darr white precipitate + ...

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  8. What will happen ? (Also write the chemical equations). When H(2)S...

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  9. A nitrite solution is added to a saturated solution of iron (II) acidi...

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  10. Why is it necessary to test for the acid radicals first (with dilute) ...

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  11. Why chromyl chloride test is carried out in a dry test tube ?

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  12. STATEMENT-1 : Henry's law and Raoult's law are not independent, i.e., ...

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  13. Thermal decomposition of a Mn compound (X) at 513 K results in compoun...

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  14. Dilute Hydrochloride acid contains Cl- ions but it does not give posit...

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  15. Identify the gas A, B and C.

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  16. Why heavy metal chlorides such as Hg(2)Cl(2), AgCl, PbCl(2) etc. do no...

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  17. Why is a freshly prepared solution of FeSO(4) used for the detection o...

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  18. Interfering radicals interfere the test of

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  19. In which of the following reagents, the white precipitate fo PbSO(4) i...

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  20. How will you distinguish between sulphite and sulphate ions?

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