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Can we use NaCla and NaOH in place of Na...

Can we use NaCla and NaOH in place of `Na_(4)Cl` and `NH_(4)OH` in the group III cation precipitation.

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No, `NaOH` is a strong base and highly ionised, even in the presence of `NaCl,[OH^(ɵ)]` will be large enough to precipitate `Zn(OH)_(2),Mg(OH)_(2)` etc.
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Discuss the role of NH_(4)OH in group III of basic redicals.

$ V group basic radicals are precipitated as their carbonates in presence of NH_(4)OH ! NH_(4)OH maintains the pH of the solution basic.

CENGAGE CHEMISTRY-QUALITATIVE INORGANIC SALT ANALYSIS-Viva Voce Questions And Part-C (Analysis Of Cations)
  1. How will you distinguish between ferrous and ferric salts?

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  2. Can we add NH(4)OH first and NH(4)Cl later in the analysis of group II...

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  3. Can we use NaCla and NaOH in place of Na(4)Cl and NH(4)OH in the group...

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  4. Why are Zn,MnNi,Co not precipitated n the group III as hydroxides?

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  5. Why are the group IV cations not precipitated as sulphides on passing ...

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  6. Why is a brownish ppt. obtained in group II even if iron aluminium and...

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  7. Why sometimes, a black coloured precipitate obtained in group IV even ...

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  8. Why excess of NH(4)OH is used in precipitating the sulphides of group ...

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  9. Why sometimes colloidal precipitate is obtained in group IV? Comment

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  10. Why is NH(4)Cl essential in the precipitation of group V cations?

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  11. Does the excess of NH(4)Cl affect the precipitation of group V cations...

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  12. Why are all aqueous solution of the cobaltous salts pink?

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  13. At times NH(4)OH is added before adding (NH(4))(2)CO(3) to precipitate...

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  14. How will you remove the excess of NH(4)Cl before adding (NH(4))(2)CO(3...

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  15. Why is CaSO(4) not precipitated on adding ammonium sulphate to a solut...

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  16. At times warming is suggested while precipitating group V cation expla...

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  17. Can we use NaCO(3) in place of (NH(4))(2)CO(3) in group V?

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  18. Why do we test group V cations in the order of Ba, Sr, and Ca?

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  19. Why is only acetic acid employed for dissolving the group V ppt.

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  20. Sometimes no precipitate is obtained even if group V radicals are pres...

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