Look up the density of water at 20C and the density of water at 25C. They are not the same. Knowing that mass = volume x density, then density = mass/volume. The volume you calculate for the flask will be different and that will cause the density of your determination to be different. Plug in the two density numbers and see how that affects the results. Post you thoughts if you need more assistance. A hint:
d@20C = 0.998703 g/cc
d@25C = 0.997044 g/cc
volume of the flask = m/d so the volume Patricia uses will be too low. How will that affect Patricia's density?
Sam Student calibrates a flask with water at 20C. Patricia Pupil borrows the flask and Sam's calculated volume for the flask, and uses it to do her unknown at 25 C. What, if any specific effect will this have on the results of Patricia's density determination? Explain your answer.
My Chem teacher didn't even try to explain how to do this problem. Any help is appreciated. ;)
2 answers
Thanks. I think I get it, but I don't know how to get the mass...