Chemical Forums

Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: scarmel on July 04, 2017, 07:19:33 AM

Title: calculation of freezing point
Post by: scarmel on July 04, 2017, 07:19:33 AM

hi
i am trying to figure out the way to calculate the freezing point of an aqueous solution which have 5 different components.

if someone can refer me to an example or give me and example it will be great
thanks in advance

sharon

Title: Re: calculation of freezing point
Post by: XeLa. on July 04, 2017, 07:24:57 AM

First of all, what substances are we talking about?

Also, are we wanting to determine this freezing-point algebraically or experimentally?

KungKemi

Title: Re: calculation of freezing point
Post by: scarmel on July 04, 2017, 08:52:08 AM

Hi KungKemi

the substance are (for example) tween 80, L-arginine, ascorbic acid

i wish to be able to determine it algebraically

many thanks
sharon

Title: Re: calculation of freezing point
Post by: XeLa. on July 05, 2017, 02:28:35 AM

Your best bet for determining it algebraically is the freezing-point depression equation:
https://en.wikipedia.org/wiki/Freezing-point_depression (https://en.wikipedia.org/wiki/Freezing-point_depression)
However, it does require knowledge of how the mixture was made, such as quantities of solutes and solvent. Also, depending on the situation (such as the concentration of the solution, and the activity of solute particles) the determined value can vary in accuracy.

I hope this helps.