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June 11, 2024, 07:10:31 pm
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Author Topic: Aspirin in reaction  (Read 1394 times)  Share 

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Aspirin in reaction
« on: July 21, 2008, 07:36:00 pm »
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Acetyl salicyclic acid (, relative atomic mass 180) is an acid called aspirin with one replaceable hydrogen (monoprotic). A tablet of aspirin contains aspirin and fillers. A tablet is crushed and dissolved in water. The acid in it was neutralised by 12.25mL of 0.1466 M NaOH. 1 grain of aspirin = 0.0648g.



How many grains of aspiring are in the tablet?

A. 232
B. 20.9
C. 15.0
D. 4.99

Thanks. The main problem I have with this question is I don't know what the M stands for in 0.1466 M NaOH.
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orangez

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Re: Aspirin in reaction
« Reply #1 on: July 21, 2008, 07:38:44 pm »
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The M stands for "molar" or "mol / L" -- unit for molarity/concentration.
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Matt The Rat

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Re: Aspirin in reaction
« Reply #2 on: July 21, 2008, 07:39:31 pm »
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Molarity.

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Re: Aspirin in reaction
« Reply #3 on: July 21, 2008, 07:41:05 pm »
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@ orangez

But shouldn't the molar mass of NaOH be (23+16+1) = 40 M?

So... M used interchangeably for Molar Mass and Concentration?
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orangez

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Re: Aspirin in reaction
« Reply #4 on: July 21, 2008, 07:41:38 pm »
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Molar mass is measure in g/mol
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orangez

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Re: Aspirin in reaction
« Reply #5 on: July 21, 2008, 07:42:57 pm »
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is the concentration of NaOH  :)
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Re: Aspirin in reaction
« Reply #6 on: July 21, 2008, 07:46:15 pm »
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ok thanks
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Mao

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Re: Aspirin in reaction
« Reply #7 on: July 21, 2008, 07:49:30 pm »
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Quote from: DivideBy0 on July 21, 2008, 07:41:05 pm
@ orangez

But shouldn't the molar mass of NaOH be (23+16+1) = 40 M?

So... M used interchangeably for Molar Mass and Concentration?


you've confused M [a unit for concentration measured in ] with [the relative molecular mass measured in , also applies to to a lesser extent]
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Re: Aspirin in reaction
« Reply #8 on: July 21, 2008, 08:05:28 pm »
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Lol... in my class we just use for relative molecular mass. I'll take note of this :P, thanks
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Collin Li

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Re: Aspirin in reaction
« Reply #9 on: July 21, 2008, 10:11:38 pm »
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M is a unit, standing for "Molarity"

M(NaOH), on the other hand, is often how you'd refer to the molar mass of NaOH.

They are different.

Examples:

[NaOH] = 0.1366 M
M(NaOH) = 40.0 g/mol

(Note that a species in square brackets often means its concentration)
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