Chemical Forums
Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: sachabinky on August 11, 2017, 12:38:39 AM
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Could a substitution Reaction with Potassium Chloride and Sodium Pyrophosphate work to Produce Potassium pyrophosphate?
- or is it best made up from Potassium Phosphate, then heating?
I see there is a process described for the fomation of Tin Pyrophosphate from the aforementioned Sodium Compound, using Stannous Chloride in solution, as a substitution reaction.
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If you do so you will not get a clean product. It will be a mixture of potassium and sodium pyrophosphates and chlorides.
Better is the heating process, but I think you have to use potassium dihydrogen phosphate.
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Thank you very much.
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You should be able to put an ion-exchange column such as Dowex-50 into the potassium form and put sodium pyrophosphate onto this column. Sodium ions will displace potassium ions. The exchanger would have to be present in large excess.
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To follow up on my previous comment, one needs a large excess, typically at least 20-fold in terms of equivalents, of exchange capacity in the ion-exchanger, in order for this to work.