2. A solution is prepared by dissolving 1.50 g of Pb(NO3)2 in a small amount of water and diluting to a total volume of 250.00 mL.
a. Write a chemical equation (with phase symbols) to show what happens to a formula unit of Pb(NO3)2 when it is dissolved in water.
b. What is the molarity of this solution?
c. If a 25.00 mL sample of this solution were removed and diluted to a total volume of 100.00 mL, what would be the molarity of the diluted solution?
a) Pb(NO3)2(s) ----> Pb2+(aq) + 2NO3-(aq)
b) n = m/Mr = 1.50/331 = 0.0045 mol 0.0045 mol in 250 ml x mol in 1000 ml x = 0.018 mol/1000 ml = 0.018 M
c) in 1000 ml is 0.018 mol in 25 ml is x x = 0.00045 mol 0.00045 mol in 100 ml x mol in 1000 ml x = 0.0045 M
Once you reach college or university, the level of writing that is expected from you should be quite high. They…
APPROVED BY CLIENTS
I ordered the Excel assignment here twice. The customer service is very patient and willing to answer any question that customer may have.Also, the programmer is very professional. They completed my assignment in advance and make sure you get a full grade. I would definitely recommend this website to my friends who need help:)