What Does the Molar Composition in Crystal Synthesis Mean?

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SUMMARY

The discussion focuses on the interpretation of molar composition in crystal synthesis, specifically a reaction mixture consisting of 3.0 SiO2, 1.0 Al2O3, 0.1 NaCl, and 276 H2O. Participants clarify that the values represent moles of each compound, not molar fractions, and suggest that the high water volume indicates a significant dilution. The conversation concludes with a method for calculating the required amounts of each compound based on a fixed volume of water, demonstrating a practical application of the molar ratios.

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  • Understanding of molar composition and stoichiometry
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ch3m
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Hi guys,
I'm facing a problem.
I've read a paper where they tried to synthesise a crystal and they give the following reaction mixture molar composition:
3.0 SiO2
1.0 Al2O3
0.1 NaCl
276 H2O

What does it means?
It can't be the molar fraction since the sum of all the fraction must give 1 as result.
I guess that it should be the mol of each compound in solution, but that means that they have almost 5 L of water... am I right?
 
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ch3m said:
I guess that it should be the mol of each compound in solution, but that means that they have almost 5 L of water... am I right?

That's how I would read the information.

No idea why they reported it this way, perhaps that's a convention used in such papers.
 
Borek said:
That's how I would read the information.

No idea why they reported it this way, perhaps that's a convention used in such papers.

Thanks.

So can I take such values as a ratio??

I mean: 3.0:1.0:0.1:276

So if I fix a volume of 250 ml of water which means 13.877 mol, I need to divide the mols for 276 and then multiply for the ratio.
i.e. for Al2O3 --> 13.887*(1/276) and for NaCl 13.887*(0.1/276)
Right?
 
Looks OK.
 

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