How Is Concentration of Pure Water Calculated?

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The discussion centers around the density and concentration of water, clarifying that the density of water is 1000 g/L, which means 1 liter of pure water weighs 1 kilogram. There is confusion about calculating concentration, as the concentration of pure water is not typically expressed in moles per liter since it is a solvent without solute. The calculation presented (1000 g/18 g/mol = 55 M) is acknowledged as mathematically correct but deemed unnecessary because it misrepresents the concept of concentration in this context. The conversation emphasizes understanding the distinction between density and concentration, noting that the density of water is a well-established fact. Additionally, it touches on historical standards of measurement, explaining that the original intent of the metric system was to have 1 liter of water weigh exactly 1 kg.
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Ok density of water is 1000 g/ 1 L

I don't know isn't this 1 L composed completely of water. This is confusing me. Do find the concentration you have to find the moles and divide by 1 L. 1000/18=55 M . I thought concentration of pure water you can't find because the solution is complete water. I hope you understand what I mean. Thanks :smile:
 
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Are you confusing density with concentration? There is 1000g of water in a volume of 1L if that 1L contains entirely water...
 
sameeralord said:
Ok density of water is 1000 g/ 1 L

I don't know isn't this 1 L composed completely of water. This is confusing me. Do find the concentration you have to find the moles and divide by 1 L. 1000/18=55 M . I thought concentration of pure water you can't find because the solution is complete water. I hope you understand what I mean. Thanks :smile:

your math and equations are right. the density is just 1 kg/L as you have shown. The concentration of moles / liter is actually moles of solute / liter of solvent. so technically the solute mole would be 0, the 55 mole is actually the solvent mole. So again technically it's 0 mole /1 L so it's 0 still. The 55 is useless, and unnecessary. Just a definition thing, don't fuss over it too much. You got the big stuff right
 
water is a universal liquid or solution or whatever you can call it.

Accept its density as a universal fact !

:-p

your theory is right though but everything which we come across today has already been proved, hasnt it ? !
 
sameeralord said:
Ok density of water is 1000 g/ 1 L

I don't know isn't this 1 L composed completely of water. This is confusing me. Do find the concentration you have to find the moles and divide by 1 L. 1000/18=55 M . I thought concentration of pure water you can't find because the solution is complete water. I hope you understand what I mean. Thanks :smile:

The intent of the pre-SI system was to have 1 liter of pure water (at 4 C) weigh exactly 1 kg (at standard gravity; representing 1 kg of mass). In fact, this was still too imprecise for a metric standard. Today, the standard is a 1 kg platinum-iridium cylinder kept at a secure location in France.

http://www.essex1.com/people/speer/mass.html
 
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