Problem: A combination of 0.010 mol of plumbous ions and 0.0010 molof iodide ion

Question

Problem: A combination of 0.010 mol of plumbous ions and 0.0010 molof iodide ions in 1.0 L of solution forms a/an _____because____.

A. unsaturated solution Q>K
B. unsaturated solution Q< K
C. precipitate Q<K
D. precipitate Q>K

My teacher gave us a worksheet to complete for homework,and we willbe going over it in class. He likes to call on people for answersand I don't want to look stupid if I don't know the answer. I gotlost when I was trying to look in the appendix to see what the Kspwas. I don't understand it because I have no idea what plumbous is,or if it is even irrelevent to the problem. Thanks so much!

Explanation / Answer

Plumbous ion stands for Pb 2+ We know   PbI 2 <------> Pb2+ + 2 I- Ksp for PbI2 = 8.5 * 10-9 Volume = 1 L So [ Pb2+] = 0.01 / 1 L                   =0.01 M [ I-] = 0.001 / 1L         = 0.001L Q = [ Pb2+] [ I-] 2     = [ 0.01] [ 0.001] 2     = 0.00000001     = 1 * 10-8 Since Q > ksp, a precipitate occurs. So answer is D Since Q > ksp, a precipitate occurs. So answer is D

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