Arsenites, AsO3-, and arsenates, AsO

32 Arsenites, ASO3, and arsenates, AsO See under arsenic, Sections 3.12 and 3.13. 

The metallic chromates are usually coloured solids, yielding yellow solutions when soluble in water. In the presence of dilute mineral acids, i.e. of 

Solubility the chromates of the alkali metals and of calcium and magnesium are soluble in water strontium chromate is sparingly soluble. Most other metallic chromates are insoluble in water. Sodium, potassium, and ammonium dichromates are soluble in water. 

To study these reactions use a 0.1m solution of potassium chromate, K2Cr04, or potassium dichromate, K2Cr207. 

Barium chloride solution pale-yellow precipitate of barium chromate, BaCr04, insoluble in water and in acetic acid, but soluble in dilute mineral acids. 

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