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April 19, 2014

Homework Help: Chemistry - titration lab

Posted by Robertq on Tuesday, July 31, 2012 at 11:42am.

Hello.

For my chemistry of solutions class, we had a titration lab where we titrated NaOH into an HCl + H2O mix. This was a preparatory titration for the next one consisting of the hydrolysis of ethyl acetate into acetic acid with H+ ions as a catalyst (in our case the HCl).

So now, after we did 4 stock HCl titrations which are the practice ones, we're asked those 2 questions:

Mass of HCl in 5.00 mL HCl solution
Mass of 5.00 mL HCl solution (d=1.05g/mL)

Now I put the same answer in both as 5mL * 1.05 g/mL = 5.25g.
So my question is, what exactly is the difference between those 2 questions, are they asking for the same thing?

Also, further down they ask to find the Mass of H2O in 5mL HCl solution and the moles of H2O. Is this going to be calculated using the water density?

Thank you for your time.

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