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Sodium tetraborate pentahydrate vs sodium tetraborate decahydrate

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winter:
Hi, What is the difference between sodium tetraborate pentadrate and sodium tetraborate decahydrate? I am trying to make a product that I use frequently in my work - the formula is Na2B4O7-5H2o    I need to make it as exact as possible.  Thank you for any help that you can offer




Edit: Edited title for Indexing purposes. Mitch

Mitch:
The difference is 5 water molecules. The decahydrate has 10 water molecules.

If its in a solution, you kinda have to expect you'll have an equilibrium mixture of the 2 substances. You could try using molecular sieves so you can push the synthesis towards the petahydrate. But, I would need to know more details of what exactly you are doing.

AWK:
Pentahydrate can be obtained during crystallization of borax (decahydrate) at 80 C.

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