Question

The formula of Ammonium phosphomolybdate is

• A. \((NH_4)_3PO_4.12MoO_3\)
• B. \((NH_4)_2.12MoO_4\)
• C. \((NH_4)_2PO_4.12MoO_3\)
• D. \((NH_4)_3PO_3.12MoO_3\)
• E. \((NH_4)_3PO_4.2MoO_3\)

Hint:

Ammonium phosphomolybdate is commonly used in phosphate determination and is a useful reagent in quantitative chemical analysis.

Answer 1

The Correct Option is A

Ammonium phosphomolybdate is a compound that contains ammonium ions (\(NH_4^+\)), phosphate (\(PO_4^{3-}\)), and molybdenum oxide. It is often used in analytical chemistry for phosphate determination.
- Option (A): The correct formula for Ammonium phosphomolybdate is \((NH_4)_3PO_4.12MoO_3\), where there are 12 moles of MoO₃ (molybdenum trioxide) for every 1 mole of phosphate.
- Option (B): This is not correct, as it doesn't match the formula of ammonium phosphomolybdate.
- Option (C): This is incorrect because it doesn’t account for the correct stoichiometry of the molybdenum and phosphate components. - Option (D): This is incorrect, as the formula of phosphomolybdate contains 12 MoO₃ units, not 3.
- Option (E): This is incorrect as the molybdenum oxide count is also wrong.
Thus, the correct answer is (A) \((NH_4)_3PO_4.12MoO_3\), which correctly represents the formula of Ammonium phosphomolybdate.