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Topic: Substitution Reaction for Potassium Pyrophosphate  (Read 3296 times)

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Offline sachabinky

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Substitution Reaction for Potassium Pyrophosphate
« on: August 11, 2017, 12:38:39 AM »
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.

Offline chenbeier

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Re: Substitution Reaction for Potassium Pyrophosphate
« Reply #1 on: August 12, 2017, 06:42:17 AM »
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.

Offline sachabinky

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Re: Substitution Reaction for Potassium Pyrophosphate
« Reply #2 on: August 14, 2017, 08:20:05 AM »
Thank you very much.

Offline Babcock_Hall

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Re: Substitution Reaction for Potassium Pyrophosphate
« Reply #3 on: August 14, 2017, 03:41:44 PM »
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.

Offline Babcock_Hall

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Re: Substitution Reaction for Potassium Pyrophosphate
« Reply #4 on: August 17, 2017, 11:40:37 AM »
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.

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