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A Brief Introduction To Chromic Potassium Sulfate Indicator Method
- Jun 07, 2017 -

Chromic Potassium Sulfate indicator method:

With K2CrO4 as the indicator, silver nitrate as a titrant, the use of the end of a little excess of Ag + and K2CrO4 brick red Ag2CrO4 precipitation to indicate the end of the titration method.

Chromic Potassium Sulfate Use conditions: Requires K2CrO4 indicator to have sufficient concentration. In the general titration, CrO42- concentration of about 5 × 10-3mol / L more appropriate, that is 50-100 ml titration by adding 1ml 5% K2CrO4 indicator; K2CrO4 indicator only in the near neutral and weak base In a solution.

Chromic Potassium Sulfate Application: commonly used in the determination of Cl-, Br-, weak alkaline solution can also be measured CN-, and should not be determined I- and SCN-.

(A) physical and chemical properties and uses

Orange-red plate-like crystal, in contact with the combustible fire. The proportion of 2.676. The temperature of 398 ° C, above 500 ℃ oxidation to produce chromic acid and chromium oxide. This product is a very wide range of chromium compounds for chromic acid mixture and dichromic acid titration and other laboratory applications, industrial chromate, dichromate manufacturing, organic synthesis, electroplating, preservatives, pigments, mordant Agents, photography, printing, batteries, safety matches, chemical abrasives and so on. The following are the same as the "

(B) Toxicity

Hexavalent chromium toxicity is greater than trivalent chromium. Chromium is also a sensitizing source, hexavalent chromium is irritating and corrosive, chromium is a carcinogen. The following are the same as the "

(C) the impact of short-term over-exposure

Inhalation can occur after respiratory tract inflammation, asthma, chrome ulcers. The following are the same as the "

(Iv) the impact of long-term exposure

Repeated or long-term exposure to low concentrations of chromium compounds chrome workers, can occur chronic upper respiratory tract inflammation, chrome nose disease, contact dermatitis, rash occur in the face, neck, hands, forearm and other exposed parts of the liver, kidney damage Causing changes in the blood system. The latency of lung cancer is 10-20 years. The following are the same as the "

(5) fire and explosion

Under normal circumstances, not easy to explode. The following are the same as the "

(6) Chromic Potassium Sulfate chemical reactivity

Strong oxidizing, slightly soluble in water.