The chromate ion (CrO4-2) has yellow colour so all the chromate compounds including silver chromate is yellow in colour.
Silver Chromate Ag=Silver CrO4= Chromate(a polyatomic ion)
No
6
Silver chloride is 1/10 soluble than silver chromate in the cold 1/3 in hot water. That means silver will incline to precepetate as AgCl preferentially. More over if chromate will form it will convert to silver nitrate.
The chromate ion (CrO4-2) has yellow colour so all the chromate compounds including silver chromate is yellow in colour.
Silver chromate has a brown red colour
Silver Chromate Ag=Silver CrO4= Chromate(a polyatomic ion)
Silver(I) chromate = Ag2CrO4
Silver chromate is not soluble in water.
Two types: silver (Ag+) and chromate (CrO4-2) And within the formula (Ag2CrO4) there are two silver ions and one chromate ion for a total of three ions.
Chromate
At the end point, so after all Cl- has reacted with Ag+, a brown-red precipitate of silver chromate (Ag2CrO4), is formed. (Argentometric indicator)Description:The solubility of silver chromate is slightly higher than that of silver chloride. So, in a mixture of both ions silver chloride will be formed. Only when no chloride is left silver chromate will be formed and precipitated out.Prior to the endpoint the solution has a milky lemon yellow appearance, due to the color of the chromate ion and the precipitate of silver chloride already formed.When approaching the endpoint, additions of silver nitrate lead to steadily slower disappearing red colorations. When the red brownish color remains (with grayish spots of silver chloride in it) the endpoint of titration is reached. (wikipedia)
No
Silver(I) chromate --Δ--> Chromium(III) oxide + Silver + Oxygen2Ag2CrO4 --Δ--> Cr2O3 + 4Ag + 2.5 O2
Ag2CrO4
Yellowish