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Topic: Best way to caculate grams needed from molar ratio for a buffer solution?  (Read 957 times)

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Offline spence_rosie_12

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Best way to caculate grams needed from molar ratio for a buffer solution?
« on: March 09, 2020, 06:09:50 PM »
I have used the henderson hasselbalch to calculate that for a buffer containing NaH2PO4 2H2O and Na2HPO4 with a pH of 7 I need a ratio of 1 to 0.72 . But I want to calculate how many grams needed for a solution of 0.1M. How do I proceed to calculate grams?
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Offline Borek

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Re: Best way to caculate grams needed from molar ratio for a buffer solution?
« Reply #1 on: March 09, 2020, 06:50:16 PM »
Grams of what?

More or less it is always volume -> number of moles -> mass.
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Offline spence_rosie_12

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Re: Best way to caculate grams needed from molar ratio for a buffer solution?
« Reply #2 on: March 09, 2020, 07:18:39 PM »
I mean how to calculate how many grams needed of each NaH2PO4 2H2O and Na2HPO4 ?
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Offline AWK

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Re: Best way to caculate grams needed from molar ratio for a buffer solution?
« Reply #3 on: March 09, 2020, 08:24:33 PM »
Divide 0.1 mol in ratio 1:0.72 and then count the weight of the buffer components. You will get the masses needed to make 1 liter of solution.
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