Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Jusaquikie

how many of these solutions could be used to precipitate Pb2+ ion from .2 M solution of lead nitrate

  • one year ago
  • one year ago

  • This Question is Closed
  1. Jusaquikie
    Best Response
    You've already chosen the best response.
    Medals 0

    i think they would break down as follows Lead Nitrate Pb2+ 2(NO3) KCl = K+ Cl- KOH = K+ (OH)- NaCH3COO = guessing Na+ CH3- COO CaBr2 = Ca^2+ Br-

    • one year ago
  2. Jusaquikie
    Best Response
    You've already chosen the best response.
    Medals 0

    The answer is 3 but i don't know how to figure this out. I would have guessed 1 because CaBr2 is the only 2Br- to strip away the2 (NO3)

    • one year ago
  3. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    NaCH3COO would dissociate in to Na+ and CH3COO- (which is the conjugate base of acetic acid) you're finding out which solution would precipitate Pb^2+ out so look at solubility tables, i'm pretty sure Pb(OH)2 is insoluble maybe PbBr2

    • one year ago
  4. Jusaquikie
    Best Response
    You've already chosen the best response.
    Medals 0

    ok on the soulubility chart provided exceptions are Br- Cl- I- and (SO4)2-

    • one year ago
  5. Jusaquikie
    Best Response
    You've already chosen the best response.
    Medals 0

    does that mean PbBr would be insouluble so that would be a precpitate?

    • one year ago
  6. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    PbBr2 ..since Pb is 2+ and Cl is 1- .. balance out charges the chart i have says PbBr2, PbCl2 and Pb(OH)2 are insoluble

    • one year ago
  7. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    so yeah, only the third one would not cause a precipitate

    • one year ago
  8. Jusaquikie
    Best Response
    You've already chosen the best response.
    Medals 0

    and (OH)- is insoulible with no exceptions for Pb so that would make 3 this makes sense now, i was trying to have Pb2+ left over after froming something witht the rest of the ions.

    • one year ago
  9. Jusaquikie
    Best Response
    You've already chosen the best response.
    Medals 0

    so all but the NaCH3COO

    • one year ago
  10. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah, thats all you can do to show they will precipitate. if you were given more information (like the concentration of the other solutions) you could've shown they precipitate using their Ksp's

    • one year ago
  11. Jusaquikie
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you again for your time i will be giving out medals all night lol i have my chem final in the morning =p Thank you

    • one year ago
  12. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    no problem man, i have those next week also. good luck with your final !

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.