Quantcast

passage 41 hyperlearning mcat science workbook 2006edition

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

medscholhopeful

New Member
10+ Year Member
Joined
Apr 12, 2006
Messages
66
Reaction score
0

Members don't see this ad.
hi.. the question-#6 reads 1g of insoluble Pb^131I^2 containing only radioactive ^131I was added to 100ml of water. then one gram of soluble NaI(with ^127I) was added to the solution and completely dissolved. Which one of the following statments is correct?

Okay so i narrowed it down to two choice of which i chose A- the addition of Na^127 I willdecrease the amount of the common ion effect but alas that was the wrong choice. The right answer was C which said the molar concentration of ^131Pb I^2 dissolved in solution will increase after the addition of Na^127 I beacuse of the dynamic equilibrium in the solution??? i just don't get it can someone please explain! thanks
 

loveoforganic

-Account Deactivated-
10+ Year Member
Joined
Jan 30, 2009
Messages
4,218
Reaction score
13
I could see how the concentration of the radioactive isotope of iodine would increase, but not the increase of the lead ii ion. Don't think that's what the answer's saying though.
 
Top