ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: tolga on February 14, 2010, 09:25:43 am

Title: units of concentration
Post by: tolga on February 14, 2010, 09:25:43 am

How do a covert 0.7mg/100ml to mg/100g

Title: Re: units of concentration
Post by: kenhung123 on February 14, 2010, 11:54:11 am

direct conversion mg/ml=mg/g

Title: Re: units of concentration
Post by: the.watchman on February 14, 2010, 11:58:59 am

Remember, 1mL = 1cm x 1cm x 1cm = 1g

Actually, does this hold for all substances?

Title: Re: units of concentration
Post by: appianway on February 14, 2010, 12:08:56 pm

Nope. Other substances have different densities.

Title: Re: units of concentration
Post by: the.watchman on February 14, 2010, 12:14:45 pm

Quote from: appianway on February 14, 2010, 12:08:56 pm

Nope. Other substances have different densities.

That's what I thought :P

Title: Re: units of concentration
Post by: kenhung123 on February 14, 2010, 12:47:39 pm

Well from what he has given you can assume that it can be directly converted.

Title: Re: units of concentration
Post by: appianway on February 14, 2010, 12:58:26 pm

I'd presume that the 100mL refers to 100mL of water, so instead of writing 0.7mg/100mL H20 you write 0.7mg/100g H20.

Althought the density of water would presumably change with temperature anyway.