1. Limited time only! Sign up for a free 30min personal 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!

Chem problem

  1. Jun 8, 2005 #1


    User Avatar

    hi forum,
    would nebody be able to help me solve this problem?

    0.18mol of potassium cyanide (KCN) was dissolved in 1.00L of a solution in which the pH was held constant at 9.70 at a temperature of 298K.

    the equilibrium concentration of CN- was 0.13M.

    Calculate Ka for the weak acid HCN.

    ne help would be greatly appreciated. :)
  2. jcsd
  3. Jun 8, 2005 #2
    What kind of an electrolyte is KCN? What do you think will happen when KCN is put in a solution the pH of which is "held constant"? What are the ions in solution? What are the constraints?

    How about showing us what your reasoning/working is so far, first?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Chem problem
  1. Chem eng problem (Replies: 2)

  2. Help on Chem problem! (Replies: 4)