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Topic: Neutralizing stomach acid  (Read 12664 times)

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Offline Forces42

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Neutralizing stomach acid
« on: May 07, 2009, 03:21:59 AM »
A Rolaids tablet contains calcium carbonate which neutralizes stomach acid. If a Rolaids tablet neutralizes 42.15 mL of .0320 M hydrochloric acid how many milligrams of calcium carbonate are in Rolaids tablet?

CaCO3 + 2HCl -> CaCl2 + H2O + CO2

this is what I have

42.15 mL sol'n x .320 M HCl/1000 mL sol'n  x  1 mol CaCO3/2 mol HCl = 0.00674 mol CaCO3

my trouble is with finding milligrams of calcium carbonate I am not sure what comes next?

0.00674 mol CaCO3 / 1000mg


Offline nj_bartel

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Re: Neutralizing stomach acid
« Reply #1 on: May 07, 2009, 03:31:59 AM »
figure out the number of grams in one mole, multiply that by 1000 mg per gram, multiply that by the number of moles you have (which you already figured out).

Offline Forces42

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Re: Neutralizing stomach acid
« Reply #2 on: May 07, 2009, 03:50:46 AM »
Is this how it should look

0.00647 mol CaCO3 x 100.09g CaCO3 / 1 mol CaCO3 x 1000 mg/ 1 g = 648 mg of calcium carbonate

Offline Borek

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Re: Neutralizing stomach acid
« Reply #3 on: May 07, 2009, 04:05:22 AM »
.0320 M hydrochloric acid

Quote
.320 M HCl

Which one is correct?

0.00674 mol CaCO3

0.00647 mol CaCO3

Watch out.
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Offline AWK

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Re: Neutralizing stomach acid
« Reply #4 on: May 07, 2009, 04:08:07 AM »
Quote
42.15 mL sol'n x .320 M HCl/1000 mL sol'n  x  1 mol CaCO3/2 mol HCl = 0.00674 mol CaCO3
Where you taken into account that CaCO3 reacts with 2 moles of HCl?
AWK

Offline Forces42

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Re: Neutralizing stomach acid
« Reply #5 on: May 07, 2009, 04:30:36 AM »
okay it is 0.320 M HCl

opps thanks, it should be 0.00674

0.00674 mol CaCO3 x 100.09g CaCO3 / 1 mol CaCO3 x 1000 mg/ 1 g  = 675 mg of calcium carbonate

Offline Borek

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Re: Neutralizing stomach acid
« Reply #6 on: May 07, 2009, 04:34:42 AM »
Quote
42.15 mL sol'n x .320 M HCl/1000 mL sol'n  x  1 mol CaCO3/2 mol HCl = 0.00674 mol CaCO3
Where you taken into account that CaCO3 reacts with 2 moles of HCl?

Yes he did :)
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Offline Borek

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Re: Neutralizing stomach acid
« Reply #7 on: May 07, 2009, 04:36:04 AM »
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Offline Forces42

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Re: Neutralizing stomach acid
« Reply #8 on: May 07, 2009, 04:49:57 AM »
Yes he did :)
[/quote]

P.S. you assume I'm a he   ;)

Thank you for the help.

Offline Borek

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Re: Neutralizing stomach acid
« Reply #9 on: May 07, 2009, 09:24:01 AM »
Quote
Yes he did :)

P.S. you assume I'm a he   ;)

Wrongly? Set your sex in your forum configuration :)
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