This question is about compounds containing the ammonium ion, .
Ammonium vanadate(V), NH4VO3, is a white solid.
Write the ionic equation for the conversion of to on the addition of dilute sulfuric acid. State symbols are not required.
The zinc reduced the vanadium in a series of reactions.
The student suggested that the sequence of colours observed could be explained by the presence of the vanadium species shown in the table.
Sequence of colours observed | starting colour green blue green violet |
Suggested vanadium species | V3+ VO2+ V3+ V2+ |
Explain whether or not the student is correct.
Refer to oxidation states of vanadium and account for each colour in the sequence.
Suggest an explanation for these observations.
Ammonium tetrachlorocuprate(II) dihydrate, (NH4)2CuCl4•2H2O, is a blue-green solid.
When ammonium tetrachlorocuprate(II) dihydrate is dissolved in water, a blue-green solution T is formed.
Give a test to identify the gas stating the positive result of the test.
A white solid with a slight vinegar-like smell contains ammonium ions, , and an anion represented by Y− .
The smell of vinegar intensifies on the addition of a few drops of concentrated sulfuric acid to an aqueous solution of NH4Y.
On subsequent addition of a few drops of ethanol and heating the mixture, the smell of vinegar is replaced by a sweet and fruity smell.
Explain how all this information can be used to identify the anion Y−.
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