Is lead chromate soluble in water
|molar mass 194.191 g / mol |
AGW n / a, carcinogenic substance
Melting point + 974 ° C
density 2.73 g / cm3
100g H2O dissolve 63.68 g at 20 ° C
|Hazard classes + category |
Corrosive / irritant effect. on the skin 1B
Serious eye damage / irritation 2
Skin sensitization 1
Germ cell mutagenicity 1B
Carcinogenicity inhalation 1B
Spec. Target organ tox. e. Resp. 3rd
Water vessel. acute / chronic 1
|HP rates (see note) |
H 315, 317, 319, 335, 340, 350i, 410
P 261, 273, 280.1-3 + 5 + 7, 302 + 352, 305 + 351 + 338, 308 + 313
disposal special instructions
|print a label||German name||English name|
|CAS7789-00-6||Potassium chromate||Potassium chromate|
Note for schools: Potassium chromate (and also sodium chromate) is carcinogenicity in German schools due to its assignment to the hazard classes and Germ cell mutagenicity, Category 1B prohibited. It is recommended not to use this material in schools in Switzerland or in other countries either.
Potassium chromate forms intensely yellow crystals that do not attract water and are not hygroscopic. When heated to over 670 ° C, potassium chromate changes to a red, hexagonal modification. When mixed with flammable substances, easily flammable mixtures are formed. However, it is not quite as oxidizing as potassium dichromate. The toxicity is also somewhat lower, but it is still a very dangerous substance for health.
An external comparison of two toxic chromates
Potassium chromate serves as a detection reagent for lead ions. If an aqueous potassium chromate solution is added to an aqueous solution of lead (II) nitrate or lead (II) acetate, an intense yellow lead (II) chromate precipitates:
Pb2+ + CrO42- PbCrO4
The lead (II) chromate was previously used as a yellow pigment called "Paris Yellow". However, due to its toxicity, it is no longer produced for paints today.
Add a potassium chromate solution to a soluble one
Lead salt solution, yellow lead chromate precipitates.
Production takes place in the laboratory from aqueous potassium dichromate solution and potassium hydroxide solution. By raising the pH value with the help of the potassium hydroxide solution, the equilibrium of the reaction is shifted to the right, so that the potassium chromate is increased:
H2O + K2Cr2O7 + 2 KOH 2 K2CrO4 + 2 H.2O
Potassium chromate used to be used as a mordant in dyeing and for the preparation of lead chromate. It was also used in printing and ink making. It is used as an indicator in dimensional analysis. Since sodium chromate is cheaper to manufacture, this salt largely replaces potassium chromate today.
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