Posted by Jenn on Thursday, January 27, 2011 at 10:45pm.
Sorry I meant Na2CrO4 and Na2Cr2O7 and basically i need to know if they react exactly the same with different elements
I don't know if they react with all elements the same. I do know that Pb(NO3)2 reacts with BOTH Na2CrO4 and Na2Cr2O7 to produce the same product of PbCrO4.
CrO4^-2 is the product in basic solution and Cr2O7^-2 is the product in acid solution. The two are shown below as a reaction.
2CrO4^-2 + 2H^+ ==> Cr2O7^-2 + H2O
I suspect the correct answer is to say that the product depends upon the pH of the reaction mixture. In highly acid solution the dichromate prevails and in basic/neutral solution the chromate predominates.
Dichromate is a stronger oxidizing agent than chromate.
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