ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: SDPHD on March 19, 2011, 12:51:48 pm

Title: Volumetric Question
Post by: SDPHD on March 19, 2011, 12:51:48 pm

Hey guys,

I cant seem to get my head around part d of this question.

[IMG]http://i.imgur.com/94BvC.png[/img]

I've had a look at the worked solutions but I don't understand it.

I was wondering if there was more than one way to do it (ie an easier to understand way maybe?)

Thanks for any help.

Title: Re: Volumetric Question
Post by: Souljette_93 on March 19, 2011, 05:28:06 pm

Yeah, this is all about using ratios.

so you must have found out that the Concetration is 0.0855 M

This means that there is 0.0855 mol per litre, so how many mole is in a 100 L?

so I work it out like this:

0.0855 per 1 L
x per   100L

then finding x=8.55 mol

then with that mole multiply to find the grams of NaOH:

8.55 * 40=342 g

Title: Re: Volumetric Question
Post by: SDPHD on March 20, 2011, 06:27:22 pm

Thanks for the reply!

It took me a while, but I understood it in the end.

 :D