What is the formula of ammonium molybdate?

(NH4)6Mo7O24
Ammonium heptamolybdate/Formula

What product is formed when ammonium molybdate reaction with the phosphate?

Inorganic phosphate is commonly assayed by reaction of phosphate ions with ammonium molybdate to form a phosphomolybdate complex that is then measured spectrophotometrically, either by direct UV absorption at 340–363 nm or after reaction with a reducing agent to increase stability and color formation, measured at 600– …

Which Colour precipitate appear when phosphate ions react with ammonium molybdate?

yellow
When a solution of acid ammonium molybdate reacts with a sufficient con- centration of phosphate ions, a yellow solid of ammonium phosphomolybdate is precipitated.

Is ammonium molybdate an acid or base?

Acidic salts, such as AMMONIUM MOLYBDATE, are generally soluble in water. The resulting solutions contain moderate concentrations of hydrogen ions and have pH’s of less than 7.0. They react as acids to neutralize bases.

How do you prepare ammonium molybdate solution?

Ammonium molybdate solution, dissolve 5 g of crushed analytical grade reagent in water and dilute to 250 ml with water. Ascorbic acid solution, dissolve 4.4 g of reagent in water and dilute to 250 ml. This solution deteriorates slowly on standing, and is best prepared freshly as required.

How do you calculate phosphate?

Since the PO4 molecule is three times as heavy as the P atom, results reported as PO4 are three times the concentration of those reported as P. For example, if you measure 0.06 mg/L as PO4, that’s equivalent to 0.02 mg/L as P. To convert PO4 to P, divide by 3. To convert P to PO4, multiply by 3.

What is the precipitating agent for phosphate determination?

Phosphate-containing compounds are dissolved in acid and converted to soluble orthophosphate ion (PO43-). The soluble phosphate is easily precipitated as quinoline molybdophosphoric acid by the addition of a single reagent. The precipitate is easily filtered, dried, and weighed.

Is ammonium molybdate toxic?

Hazard statements: Harmful if swallowed Causes skin irritation Causes serious eye irritation Harmful in contact with skin Harmful if inhaled May cause respiratory irritation Precautionary statements: Do not eat, drink or smoke when using this product Wash …

What is the principle of ammonium molybdate test?

In the reaction, inorganic phosphorus reacts with ammonium molybdate in an acidic solution to form a colored phosphomolybdate complex. The system monitors the change in absorbance at 365 nm at a fixed-time interval. This change in absorbance is directly proportional to the concentration of phosphorus in the sample.

How much phosphorus is in ammonium molybdate solution?

The range of detectable label of phosphorus concentration is 0.01–1.2 mg in 10-mm spectrophotometric cells. Sulphuric acid, 3 N. Ammonium molybdate solution, dissolve 5 g of crushed analytical grade reagent in water and dilute to 250 ml with water.

What’s the best way to make ammonium molybdate?

Ammonium molybdate solution, dissolve 5 g of crushed analytical grade reagent in water and dilute to 250 ml with water. Ascorbic acid solution, dissolve 4.4 g of reagent in water and dilute to 250 ml. This solution deteriorates slowly on standing, and is best prepared freshly as required.

How much silica is in ammonium molybdate solution?

Dissolve in water and dilute to 1 litre. This solution contains 200 μg silica per ml. Dilute with water to give a solution containing 20 μg per ml as required. Ammonium molybdate solution, dissolve 5 g of crushed analytical grade reagent in water and dilute to 250 ml with water.

How to make ammonium molybdate with hydrazine sulphate?

Solution (1). Dissolve 1.0 g of ammonium molybdate in 100 ml of 2 M H2SO4. Solution (2). Dissolve 0.10 g of hydrazine sulphate in 100 ml of water. Immediately before use, mix 10 ml of solution (1) with 10 ml of solution (2), and dilute to 100 ml with water. Solutions (1) and (2) should not be stored longer than 4 days.