Given the following data:
Trial VNaOH (mL)
1 17.48
2 17.24
3 17.62
a) The volume of acetic acid used in each trial was 15.00 mL, and the density of the acetic acid solution is 1.00 g/mL.
b) Determine which trials should be used in the analysis and which should be left out. [runs 1 and 3 should be used]
c) Determine the (average) concentration of the acetic acid solution. [0.5852 M]
d) Determine the (average) percent by mass of acetic acid in the solution. [3.51]
I understood how to do the first two questions, but the last question really has me stumped. I'm not sure if there's a formula that I need to use for the last question. I've tried searching on the internet but I found it to be unclear. This isn't really homework, this is just something for my understanding really.