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The following data came from a titration experiment.

A student titrated 10.00 mL samples of Na2SO4 with 0.350 mol/L HBr
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Trail | 1 | 2 | 3 | 4 |
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Final Buret Reading (mL) | 15.2 | 28.9| 42.8 | 14.2 |
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Initial Buret Reading (mL) | 0.6 | 15.2| 28.9 | 0.4 |
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Volume of HBr used (mL)
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1. The average volume of HBr added is ____ mL. (Three Digit Answer)

2. What is the amount concentration of Na(2)SO(4) (aq)? Show your work.

Any help would be greatly appreciated im sorry for the chart looking messed up it was the best I could do given the parameters!

2 answers

For Trail it's meant to be a column so 1 would be above 15.2 and 0.6 and then 2 above 28.9 and 15.2 etc...
The volume used in the titration is
Final reading - initial reading = volume of titration.
After you have done this for each trial then take the average. I assume you know how to do that. It's
(vol #1 + vol #2 + vol #3 + vol #4)/4 = ?
You need to tell me more about the titration for me to help calculate concn Na2SO4.