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W/w solution

Question asked by Allison Williams on Feb 22, 2019
Latest reply on Feb 23, 2019 by Alex Madonik

I am hoping someone can mark my calculatlions and tell me if I am correct or not?


if I need to make a 400ml, 5% w/w solution of 98% sulphuric acid/water, how much sulphuric acid will I need to add?


The weight of 98% sulphuric acid equals (approx) 1.84grams per 1 ml of liquid. The weight of water equals 1gram per 1ml of liquid.


Therefor a weight/weight solution of 5% in 400ml (20grams) would only require 10.86ml of 98% sulphuric acid.


20g divided by 1.84g = 10.86ml of liquid


Am am I correct in my calculations?


Any help is appreciated