Define Negative Correlation

Assay methods are used to determine the purity or the concentration of a given substance in a sample. Here are the assay methods for sodium chloride, ferrous sulfate, and hydrogen peroxide:

1. Sodium Chloride:- The assay method for sodium chloride involves titration using silver nitrate solution. The chloride ion reacts with silver nitrate to form a white precipitate of silver chloride. The endpoint of the titration is determined using a silver nitrate indicator that detects the excess silver nitrate in the solution. The amount of sodium chloride can be calculated based on the volume of silver nitrate solution used.

2. Ferrous Sulphate:- The assay method for ferrous sulfate involves the use of a reducing agent, such as potassium permanganate. The ferrous ion is oxidized by the potassium permanganate to form ferric ions, which are then detected by a colorimetric method using a suitable indicator. The amount of ferrous sulfate can be calculated based on the volume of potassium permanganate solution used.

3. Hydrogen Peroxide:- The assay method for hydrogen peroxide involves the use of a titrant, such as potassium permanganate or ceric sulfate. The hydrogen peroxide is oxidized by the titrant to form water and oxygen. The endpoint of the titration is detected by a suitable indicator, such as starch, which changes color when the excess titrant reacts with it. The amount of hydrogen peroxide can be calculated based on the volume of titrant used.

In summary, the assay methods for sodium chloride, ferrous sulfate, and hydrogen peroxide involve titration using a suitable titrant and an indicator to determine the concentration or purity of the substance in the sample.