June 07, 2020, 01:43:04 AM
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Topic: Concentration of HCL from mL of HCl and grams of Na2CO3  (Read 143 times)

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Offline AlbinoJoe2k

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Concentration of HCL from mL of HCl and grams of Na2CO3
« on: May 14, 2020, 11:17:52 PM »
I am ready to farm this out to someone else. I have been working with this for 2 hours. I never have issues solving chemistry problems so this has been incredibly frustrating.

A solution of hydrochloric acid can be standardized by reacting it with a known quantity of sodium carbonate. If 0.851 g of Na2CO3 required 41.36 mL of HCl solution to completely react in a titration, what is the concentration of the HCl solution?


So what I need is the molarity of the HCl. For some reason I cannot find it. First I tried finding the molarity of the sodium carbonate. Then I realized the problem didn't say the sodium carbonate was a solution, so molarity didn't make sense for that. Then I tried finding the molarity of the HCl by turning the mL into liters, and dividing 1 mole HCl by 0.04136 L because molarity is moles divided by liters. I realized two things about this. 1. No chemical equation is given so 1 mole would be an assumption. 2. If this were that easy I wouldn't need to use the mass of sodium carbonate.

When finishing the problem using the molarity of sodium carbonate, just to try it, I got 48.356 mol/liter of HCl. I guess this might not be impossible, but it is highly improbable.

Am I just missing something? Or is the question missing something? Even just a hint in the right direction would help
« Last Edit: May 14, 2020, 11:46:55 PM by AlbinoJoe2k »

Offline sjb

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Re: Concentration of HCL from mL of HCl and grams of Na2CO3
« Reply #1 on: May 15, 2020, 01:49:57 AM »
First - what equation is going on?

Offline AWK

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Re: Concentration of HCL from mL of HCl and grams of Na2CO3
« Reply #2 on: May 15, 2020, 03:15:46 AM »
In almost every textbook on general chemistry, inorganic, or quantitative analytical chemistry, the authors write about acid standardization by titration - see an example from Google books. Reading even a dozen or so pages takes less than two hours.
https://books.google.pl/books?id=a9emw3FvCrAC&pg=PT215&lpg=PT215&dq=titration+of+Na2CO3&source=bl&ots=fL_h85nd42&sig=ACfU3U0G6YcHy9f4qcZrPLANCpfpFjd6Pg&hl=en&sa=X&ved=2ahUKEwiG9aOIo7XpAhUw_SoKHaKlCcA4ChDoATAIegQIBxAB#v=onepage&q=titration%20of%20Na2CO3&f=false
It's really worth reading the manuals!
AWK

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