Test for Phosphate Radical

Test for Phosphate Radical Experiment General Aim

Test for phosphate radical presence.

Phosphate Test Method

Physical properties, solubility, reaction with BaCl2, confirmatory tests.

Test for Phosphate Radical Experiment: Learning Objectives

• <p>Recognize phosphate salts in powder form or solution.

• Apply the principles of safety measures.

• Differentiate between phosphate and Arsenate.</p>

Test for Phosphate Radical Experiment: Theoretical Background

Qualitative chemical analysis: Branch of chemistry that deals with the identification of elements or grouping of elements present in a sample.

The techniques employed in qualitative analysis vary in complexity, depending on the nature of the sample. In some cases, it is necessary only to verify the presence of certain elements or groups for which specific tests applicable directly to the sample (e.g., flame tests, spot tests) may be available. More often the sample is a complex mixture, and a systematic analysis must be made in order that all the constituents may be identified. It is customary to classify the methods into two classes: qualitative inorganic analysis and qualitative organic analysis.

The sample is commonly dissolved in water for the determination of anionic constituents (i.e., negatively charged elements or groupings of elements) and cationic constituents (i.e., positively charged elements or groupings of elements). The procedure followed is based on the principle of treating the solution with a succession of reagents so that each reagent separates a group of constituents. The groups are then treated successively with reagents that divide a large group into subgroups or separate the constituents singly. When a constituent has been separated it is further examined to confirm its presence and to establish the amount present (quantitative analysis). Portions of the material are dissolved separately, and different procedures are used for each to detect the cationic and anionic constituents.

Some phosphate rock is used to make calcium phosphate nutritional supplements for animals. Pure phosphorus is used to make chemicals for use in industry. The most important use of phosphate rock, though, is in the production of phosphate fertilizers for agriculture.

 

Test for Phosphate Radical Principle of Work

The purpose of the experiment is the identification of phosphate through the following steps:
1) Physical examination.
2) Solubility testing.
3) Reaction with barium chloride (Test for phosphate white precipitate).
4) Confirmatory test with silver nitrate (Test for phosphate yellow precipitate).
5) Confirmatory test with ferric chloride.
6) Confirmatory test with ammonium molybdate(Test for phosphate yellow precipitate)
7) Confirmatory test with magnesia mixture (Test for phosphate white precipitate).