March 26, 2015

Homework Help: Chemistry

Posted by Dexter on Sunday, June 5, 2011 at 9:26pm.

Hi there - I'm going to post the question as written in my book.

Three 20.0 mL samples of nitric acid are titrated with a 0.200 mol/L solution of sodium hydroxide. The results for the three trials are shown in the table below. What is the concentration of the hydrochloric acid?

Trial | 1 | 2 | 3 | average
Final Burette| | | |
reading (ml) |28.20|27.90|28.00|
Initial Buret|50.0 |50.0 |50.0 |
te reading(ml)
Volume of
NaOH added | | | |


end of question in book

my dilema:

Right off the bat I'm confused because I get a negative number for the volume added. ie. 28.20 ml - 50 ml = -21.80 ml which can't be right.

From there the rest of my answer is based on the negative number which I don't think is right. Please help me clarify how to work out the volume of the NaOH added if the final burette reading is 28.20 ml and initial burette reading is 50 ml. From there I think I can manage the rest but will probably request you verify

Thanks in advance!!!

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