we have the following MgSO4 with CAS number
7487-88-9 Magnesium sulfate
14168-73-1 Magnesium sulfate(monohydrate) MW=138.38
24378-31-2 Magnesium sulfate(tetrahydrate) MW=192.42872
15553-21-6 Magnesium sulfate(pentahydrate) MW= 210.37
13778-97-7 Magnesium sulfate(hexahydrate) MW= 228.46
10034-99-8 Magnesium sulfate(heptahydrate) MW= 246.47
the molcular weight of all above are different
we know that we use MgSO4 for Krebs solution with 1.2 mM
Are their any differences among above MgSO4?
Can any one tell me when I used one of above MgSO4 may our krebs are correct or not
Best regard
It doesn't matter which magnesium sulfate you use in Krebs. However, anhydrates tend to be more soluble than are hydrates thus you should check the solubility of the compounds before you buy one.
Thank you Gordon L Warren
but the molecular weight for each one is differ
if I used Magnesium sulfate(monohydrate) their MW =138.38 therefore we need we need 0.17 gram to make 1.2 mM
while when we use Magnesium sulfate(heptahydrate) their MW= 246.47 therefore we need 0.30 gram to make 1.2 mM
you see that in the first become 0.17 gram while in the second become 0.30 gram
is it correct or not?
Yes, you are correct in your calculations. The only thing that matters is the molarity. For a magnesium sulfate(heptahydrate), you will have to add more mass-wise than you would if you were using magnesium sulfate anhydrate. For a hydrate, that extra mass is water and it doesn't matter when making Krebs because water makes up the balance of the solution after adding all the salts.
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