Osmolarity Calculations for 5% Glucose, .89% NaCl, and 8% Glucose Solutions

[Nouranoura]

I don't know how to get the oolarity from just the percentage
See this question:
Calculate the osmolarity of each solutions:
5% glucose solution
.89% NaCl solution
And 8% glucose solution
i=1.9

 

[Borek]

Convert percentages to molarities.

 

[Nouranoura]

Convert percentages to molarities.

Yeah I know but how do I do that? Is it by using w/v %? How does the NaCl 0.89% become 8.9 g/l? That's the part that I don't get

 

[Borek]

Approximately: 1 L is 1 kg.

Precisely: take a density table, read the density for a given concentration, calculate mass of 1 L of the solution, follow from there.

 

[Nouranoura]

Approximately: 1 L is 1 kg.

Precisely: take a density table, read the density for a given concentration, calculate mass of 1 L of the solution, follow from there.

I do not follow sir how is the density related to the percentage? Please forgive me I may have not understood you. English is not my first language

Approximately: 1 L is 1 kg.

Precisely: take a density table, read the density for a given concentration, calculate mass of 1 L of the solution, follow from there.[/QUO

 

[Borek]

how is the density related to the percentage?

This is something that has to be measured. For many compounds there are ready density tables, some of them printed in chemistry handbooks, some of them available on the internet. You need to locate such a table and read the density for a given concentration.

 

[Nouranoura]

This is something that has to be measured. For many compounds there are ready density tables, some of them printed in chemistry handbooks, some of them available on the internet. You need to locate such a table and read the density for a given concentration.

Excuse me sir I did not ask what density is, I do know what it is but my question was that why would we need the density.You see the main question is part of a sample exam paper there won't be any density tables whatsoever

 

[Borek]

http://www.chembuddy.com/?left=concentration&right=percentage-to-molarity