ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: superstar1 on March 17, 2011, 02:25:12 pm

Title: Gravimetric or volumetric???
Post by: superstar1 on March 17, 2011, 02:25:12 pm

Hi, i wanted to know which one would be more accurate and why? Volumetric or gravimetric analysis.

Title: Re: Gravimetric or volumetric???
Post by: nacho on March 17, 2011, 03:41:06 pm

I believe there are more assumptions in gravimentric,
but at the same time, volumetric is subject to human error  (overshooting titrations, washing incorrectly etc).
could you really have a comparison though?

Title: Re: Gravimetric or volumetric???
Post by: homosapiens on March 17, 2011, 03:49:36 pm

It depends on what you're testing for... but generally volumetric since you have to get concordant results etc. unlike gravimetric where you usually only make one precipitate

Title: Re: Gravimetric or volumetric???
Post by: superstar1 on March 18, 2011, 12:06:28 pm

our overall conclusion for our Sac asks us to compare which is better and more accurate when finding percentage by mass of certain compund in a fertiliser.

Title: Re: Gravimetric or volumetric???
Post by: azngirl456 on March 18, 2011, 06:05:21 pm

Volumetric is more accurate seeing as gravimetric has more steps and transfers and filtering that more errors can arise easily

Title: Re: Gravimetric or volumetric???
Post by: pi on March 18, 2011, 07:16:56 pm

Quote from: azngirl456 on March 18, 2011, 06:05:21 pm

Volumetric is more accurate seeing as gravimetric has more steps and transfers and filtering that more errors can arise easily

I would tend to agree with that. There are far more errors involved in filtration and transfer of substances. And because you only do one test in gravimetric, compared to 3 concordant ones in volumetric, errors are not reduced or averaged either.

Title: Re: Gravimetric or volumetric???
Post by: iffets12345 on March 18, 2011, 09:24:52 pm

At the end of the day, you use them to measure different things....

Title: Re: Gravimetric or volumetric???
Post by: superstar1 on March 21, 2011, 02:16:00 pm

yep, alright but  we need to do an overall conclusions for our SAC where we compare which technique is better, gravimetric, volumetric or colorimetric (we did not use a colorimeter) and then we have to list reasons why our chosen analysis is most accurate.