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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: pleasehelpthankyou on October 31, 2020, 07:52:37 AM

Title: Meaning of this
Post by: pleasehelpthankyou on October 31, 2020, 07:52:37 AM

In a table I found for solubility values it says "the solubility is 100 times the mass of anhydrous compound soluble in a unit mass of water", can anyone tell me what is meant by this, in particular when it talks about the "unit mass of water". I would be so grateful for any response.

Title: Re: Meaning of this
Post by: AWK on October 31, 2020, 08:55:04 AM

In which units do you most often express solubility.

Title: Re: Meaning of this
Post by: pleasehelpthankyou on October 31, 2020, 08:58:51 AM

in g/100g, however the values seem to be a percentage and some are greater than 100, therefore I wondered whether this had something to do with "unit mass" that it mentions.

Title: Re: Meaning of this
Post by: AWK on October 31, 2020, 09:20:05 AM

Quote

in g/100g

Well, you already have a unit mass of water.

What to do when most of the solubilities are small, like 0.02, 0.3, etc. Maybe multiply by some number (eg. 100, 1000) so that all values ​​are integers?

Title: Re: Meaning of this
Post by: pleasehelpthankyou on October 31, 2020, 11:21:57 AM

Thanks for the reply. What I am struggling to understand is what "unit mass of water" essentially means?

Title: Re: Meaning of this
Post by: Corribus on October 31, 2020, 03:35:59 PM

grams of [whatever] per 1 gram of water (or whatever units you like).

Title: Re: Meaning of this
Post by: jackandersonaj1 on November 05, 2020, 08:27:32 AM

in g/100g

Title: Re: Meaning of this
Post by: AWK on November 05, 2020, 08:57:33 AM

Quote from: jackandersonaj1 on November 05, 2020, 08:27:32 AM

in g/100g

grams od substance per a 100 g unit mass of water