Knowra Potassium chromate Potassium chromate Potassium chromate is an inorganic salt, K₂CrO₄, composed of potassium ions and chromate ions. It is a yellow laboratory reagent and pigment containing toxic hexavalent chromium.
Chromate : Chromate is the oxyanion CrO₄²⁻, in which chromium has oxidation state +6. This ion gives potassium chromate its composition and characteristic yellow color.
Mohr method : The Mohr method is an argentometric titration that uses chromate as an endpoint indicator for halide ions. Potassium chromate supplies the indicator that signals the titration endpoint.
Potassium ion : The potassium ion, K⁺, is a positively charged ion formed when a potassium atom loses one electron. Two potassium ions balance the chromate ion’s −2 charge in K₂CrO₄.
Potassium dichromate : Potassium dichromate is an orange inorganic salt, K₂Cr₂O₇, containing the dichromate ion. It is a related chromium(VI) reagent with a different anion and color.
Carcinogen : A carcinogen is an agent capable of causing cancer in exposed organisms. Certain chromium(VI) compounds are recognized human carcinogens, making exposure a central concern.
Dichromate : Dichromate is the orange oxyanion Cr₂O₇²⁻, containing chromium in oxidation state +6. Chromate and dichromate interconvert as solution acidity changes.
Silver chromate : Silver chromate is a brick-red, sparingly soluble salt with formula Ag₂CrO₄. Its red precipitate marks the endpoint in the Mohr method.
Oxidation state : Oxidation state is a formal accounting convention for electron distribution in chemical compounds. It identifies chromium in potassium chromate as chromium(VI).
Sodium chromate : Sodium chromate is a yellow inorganic salt, Na₂CrO₄, containing sodium and chromate ions. It shares chromate chemistry but uses sodium instead of potassium.
Occupational exposure limit : An occupational exposure limit is a regulatory or advisory concentration intended to control workplace exposure to a hazardous substance. Limits and monitoring help control inhalation and contact risks from chromate dust.
Show all 25