1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Mixing problems

  1. May 31, 2005 #1
    Can anyone help me out with mixing solution problems, I know its not that hard I just am having trouble understanding what to do. Sometimes its X sometimes its X/volume of the tank. Can anyone explain it to me in a simple way?
  2. jcsd
  3. Jun 1, 2005 #2
    If you give us a sample problem maybe we could help break it donw for you?
  4. Jun 1, 2005 #3
    A swimming pool whose volume is 10,000 gal contains water that is .01% chlorine. Starting at t=0, city water containing .001% Cl is pumped in at 5 gal/min. The pool water flows out at the same rate. What is the % of chlorine in the pool after 1 hr? When will the pool be .002% Cl ?
  5. Jun 1, 2005 #4


    User Avatar
    Homework Helper

    Can you post an attempt?, it'll figure out what you are not understanding.
  6. Jun 29, 2005 #5
    it seems you dont know how to set up the prob. you need to find y(60).
    to do this you let y(t)=the amount of cl in the pool at time t. you need to find an expression for dy/dt.

    dy/dt = rate in - rate out

    rate in =5 gal / min * .001%

    rate out = y(t) / 10000 * 5 gal / min

    so dy /dt = (5 gal/min * .001%) - (y(t) / 10000 * 5 gal/ min)

    you then find the I.F. and intergrate
  7. Jun 29, 2005 #6


    User Avatar
    Science Advisor
    Homework Helper

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?