[CHM 111] Antacid lab

[Andrew J. Pounds]

On 10/20/2015 08:03 PM, wrote:
> Hi Dr. Pounds,
>  How exactly do I find the mmol of excess HCL and the mmol of CaCO3? 
> What values do I use?
>
> Thanks,
>
> -- 
>

The excess  millimoles of  HCl was what was titrated with your HCl.  So...


(volume of base in ml) (molarity of base)

The millimoles of acid neutralized by the antacid tablet is therefore

(20.0 ml)(molarity of acid) - (volume of base in ml) (molarity of base)


2 moles of HCl are neutralized for each mole of CaCO3  so take the moles 
of acid neutralized by the tablet and divide this quantity by two to get 
the mmol of CaCO3 per tablet.   Multiply this number by the molar mass 
of CaCO3 to get the mg CaCO3 per tablet.


-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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