chemistry 20 MC questions
posted by memo .
1- The equipment needed to carry out a titration is:
hot plate, pipet, and filter paper
heat source, test tube, and filter paper
heat source, pipet, and burette
erlenmeyer flask, pipet, and burette
2- A student correctly predicted that 10.0 g of a precipitate would form when two aqueous solutions were reacted. When the solid was filtered and weighed, only 8.0 g of solid had been collected. A cause for the discrepancy is that
Question 12 options:
the student forgot to subtract the mass of the filter paper
some precipitate went through the filter paper or funnel
the sample was still wet when weighed
the student did the reaction at STP instead of SATP
1 is D.
I don't know what you did for #2.
Thanks Dr. Bob
for #D this is the question given, there is no lab given!
Some educated guesses.
It can't be C as extra H2O when weighed would make the apparent weight more than 8.0 g.
B is a good possibility.
I doubt D since this was not a gas experiment.
A. It isn't clear how the mass of the filter paper figures into the mass of the ppt and since B looks like a good answer I would go with B.