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### Topic: Neutralizing stomach acid  (Read 13125 times)

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#### 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

#### 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).

#### 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

#### 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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#### 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

#### 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

#### 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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#### Borek

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

#### 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