February 26, 2017

Homework Help: Chemistry

Posted by Rachael on Saturday, January 15, 2011 at 7:13am.

The question is: Isotonic saline is a 0.9% (g/100ml) solution of salty water. You are asked to make up 2L of isotonic saline. How much salt should you weigh out?

I got the answer of 18g with the following working:

9 รท 1000(ml) x 100 = 0.9
Therefore 9% of 1000ml (1L) is 9g
Multiply 9g by 2 because it is for 2L of water = 18g

Is this method of calculation suitable for a chemistry assignment or is there another way to do it?


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