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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: why this assumption
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[Post New]1 Dec 2007 13:59:55 IST
    Subject: why this assumption
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newkid (2)

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can any1 explain me a concept.......
 
1)why is the conc. of H2O always taken as 55.55 mol/L
It is the conc. if we take 1g of water in 1mL
Is it the same if i take 25 g water in 120 mL suppose....???
 
 
 
    
[Post New]1 Dec 2007 17:29:37 IST
    Subject: why this assumption
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rooney (889)

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25g of water in 120 mL of what ????

This "what" is water itself.

Density of water is 1 Kg/L. So, 1000g of water = 1000 mL =1L
1000/Molecular mass of water = 1000/18 = 55.55 M
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[Post New]1 Dec 2007 18:45:05 IST
    Subject: why this assumption
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spideyunlimited (3007)

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arre all conc in aqueous mediums is done with respect to solvent ie. water...
so concentration = 55.55 mol / L always as one litre water has 55.5 moles (becos density of water is 1 Kg/ 1000 cc )
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[Post New]1 Dec 2007 21:10:28 IST
    Subject: why this assumption
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newkid (2)

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thanx guys

i m a dunce really a dunce
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