How Is Concentration of Pure Water Calculated?

[sameeralord]

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

 

[Pengwuino]

Are you confusing density with concentration? There is 1000g of water in a volume of 1L if that 1L contains entirely water...

 

[mazinse]

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

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

 

[Ali Inam]

water is a universal liquid or solution or whatever you can call it.

Accept its density as a universal fact !



your theory is right though but everything which we come across today has already been proved, hasnt it ? !

 

[SW VandeCarr]

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

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