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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Pashinko on July 28, 2016, 03:57:03 PM

Title: Concentration converting (m/v)% to (m/m)%
Post by: Pashinko on July 28, 2016, 03:57:03 PM

How would I go about converting the concentration of a 5.67% (m/v) solution to its %(m/m) equivalent. The only thing that is given is the density of the solution which is 1.2 g/ml.

Title: Re: Concentration converting (m/v)% to (m/m)%
Post by: sjb on July 28, 2016, 04:18:32 PM

Quote from: Pashinko on July 28, 2016, 03:57:03 PM

How would I go about converting the concentration of a 5.67% (m/v) solution to its %(m/m) equivalent. The only thing that is given is the density of the solution which is 1.2 g/ml.

Imagine for instance you have 100 ml of this solution. What is the mass of this, and how much is solute?

Title: Re: Concentration converting (m/v)% to (m/m)%
Post by: Pashinko on July 28, 2016, 04:53:59 PM

The solution would be 120 g and the solute would be 5.67 g?

Title: Re: Concentration converting (m/v)% to (m/m)%
Post by: AWK on July 28, 2016, 06:20:35 PM

So calculation of percentage (m/m) is straightforward.

Title: Re: Concentration converting (m/v)% to (m/m)%
Post by: Pashinko on July 29, 2016, 03:20:36 AM

So it would be 5.67 g / 120 g * 100 = 4.73% (m/m)

Title: Re: Concentration converting (m/v)% to (m/m)%
Post by: AWK on July 29, 2016, 04:03:07 AM

Exactly, except significant digits. In density you have 2 digits, than the final result should also contain 2 digits.