To prepare a 200 mL of aqueous stock solution X, you transferred 50mL of a known
ID: 675808 • Letter: T
Question
To prepare a 200 mL of aqueous stock solution X, you transferred 50mL of a known concentration solution into a 200 mL volumetricflask. If you realize that the volumetric flask was contaminatedwith water droplets after you cleanly transferred the knownconcentration solution. The 200 mL solution X will have a(higher, lower or same) concentration than(as) youoriginally calculated.
I could have sworn the answer was lower but I got it wrong...this was my reasoning:
M1V1=M2V2 assume the molarity of X is 1. (1)(.05)=(M2)(.2) ...M2=.25
So if there were extra water droplets in the vol flask, V2would be more than .2L, therefore you'd be dividing by a largernumber and M2 would be smaller. Where did I go wrong?
Also if I could get some help on this one...
You transfer a 2M stock solution of Y into a container using aslightly wet pipet containing water drops. The concentration of thetransferred solution Y has a
(lower,higher, or same) concentration than(as) 2M.
Thanks!
I could have sworn the answer was lower but I got it wrong...this was my reasoning:
M1V1=M2V2 assume the molarity of X is 1. (1)(.05)=(M2)(.2) ...M2=.25
So if there were extra water droplets in the vol flask, V2would be more than .2L, therefore you'd be dividing by a largernumber and M2 would be smaller. Where did I go wrong?
Also if I could get some help on this one...
You transfer a 2M stock solution of Y into a container using aslightly wet pipet containing water drops. The concentration of thetransferred solution Y has a
(lower,higher, or same) concentration than(as) 2M.
Thanks!