Re: Quantitative Analysis of CaO in the mixture


raconte@xxxxxxxxxxx wrote:
> Gregg wrote:
>
> > An easy way to estimate CaO, CaCO3 and CaTiO3 would be to :
> > 1. Disperse the powder in water and sparge CO2 into the slurry and stir
> > for several hours or overnight- dry the slurry then heat the powder to a
> > temperature well below the decomposition temperature of CaCO3, but high
> > enough to remove hydrated water (remember TiO2 will facilitate
> > decomposition to CaO or some calcium titanate phase) - measure the
> > weight gain..
> > The CaO will carbonate and gain weight.
> >
> > 2. Calcine the powder at 1000 C and measure the weight loss - all the
> > CaCO3 will convert to CaO
> >
> > The remainder will be CaTiO3 (provided that the stoichiometry of your
> > starting CaTiO3 was 1:1)
> >
> > If you have a large high alumina crucible - you can carbonate directly
> > in the crucible and avoid transferring the slurry back and forth from a
> > beaker.
> >
> > I would recommend using a high alumina crucible that will not react with
> > the CaO. It will be a lot easier to clean and reuse than porcelain.
> >
> > Good luck,
> > Gregg
>
> Brilliant. Now here's someone who's thinking, and applying knowledge
> they had in a practical manner to the question at hand. This group my
> not be dead yet.
>
> Yeah spammers, I'm talking to you. Can you do something like this?
> You with the ascii art and you with the Angelina Jolie vs. Einstein
> gibberish. You think you're in the same league as Gregg?


Unfortunately the S/N ratio is very low in sci.chem :-). Earlier there
used to be a lively discussion by knowledgeable scientists who have
been repelled by spammers. Mr. Alan Schwartz was one of those who
attracted a lot of trolls from sci.physics here.

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