chemistry

what is the pH of an aqeuous solution with s hydroxide ion[OH-] concentration of 7.5x10-10 M?

  1. 👍 0
  2. 👎 0
  3. 👁 100
asked by katie
  1. Calculate pOH from pOH = -log(OH^-).
    Then pH + pOH = pKw = 14.

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  2. you have to explain these better, i don't even understand them

    1. 👍 0
    2. 👎 0
    posted by katie
  3. You must tell me what you don't understand. I don't want to work the problem for you. All you need to do is to plug in OH^- and calculate pOH and from that pH. Two algebraic equations that don't get any simpler.

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  4. im struggling in this class, and i need as much help as possible.

    1. 👍 0
    2. 👎 0
    posted by katie
  5. I have plenty of help and I am pleased to help you as much as I can but I don't do homework. Again, I won't work the problem for you but tell me what you don't understand and we can get started on it.
    What do you not understand about
    pOH = -log(OH^-)?

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  6. i understand your trying to help me..but i don't understanf anything that you have helped me.im a step by step person. that's why i thought this would work

    1. 👍 0
    2. 👎 0
    posted by katie
  7. I'm glad you are a step by step person. So am I. I gave two steps.
    Step 1. pOH = -log(OH^-).
    1a. Punch in the OH^- in the problem into your calculator.
    1b. Hit the log key.
    1c. The answer jumps onto the screen.
    1d. Change the sign.
    1e. That's the pOH.

    Step 2. pH + pOH = pKw.
    2a. You know pOH from step 1.
    2b. You know pKw, or at least I assume you do. pKw is 14.
    2c. Now you have the second equation which is pH + the number for pOH = 14.
    2d. Now you solve for pH.
    2e. You have your answer and you've worked the problem.

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  8. so is this what it should look like
    pOH=-log(7.5x10-10)=9.124

    1. 👍 0
    2. 👎 0
    posted by katie
  9. Very good. That's the first step.
    Now step 2 is even easier.
    pH + pOH = pKw.
    pH + 9.21 = 14.
    pH = ??

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  10. hmm i know its 5 something

    1. 👍 0
    2. 👎 0
    posted by katie
  11. Close.
    pH + pOH = pKw
    pH + 9.21 = 14
    pH = 14 - 9.21 = ??

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  12. perfect! 4.79

    1. 👍 0
    2. 👎 0
    posted by katie
  13. Very good. Now you see how easy these things really are.

    1. 👍 0
    2. 👎 0
    posted by DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    The pH of a solution is 1. Which of the following statements are also true for the solution? (Select all that apply.) It will change the color of red litmus to blue. The concentration of hydronium ion is equal to the concentration

    asked by Cody on May 18, 2012
  2. chemistry

    what are the hydronium-ion and the hydroxide ion concentration of a solution at 25 C that is 0.0050 M strontium hydroxide, Sr(OH)2? a solution of hydrochloric acid is 0.20 M HCl. What is the hydronium-ion at 25 C? What is the

    asked by Henry on August 6, 2011
  3. biochemistry

    I just wanted to clarify anwsers. Question 23. Nucleotides contain phosphate groups bonded to the.. A) C3' or c5' atoms B). C3 or C3' atoms C). N1 or N9 Atoms D). C3 or N9 atoms E). C3 or C5 atoms The anwser that I chosen in A.

    asked by james on October 2, 2009
  4. Physics

    I just wanted to clarify anwsers. Question 23. Nucleotides contain phosphate groups bonded to the.. A) C3' or c5' atoms B). C3 or C3' atoms C). N1 or N9 Atoms D). C3 or N9 atoms E). C3 or C5 atoms The anwser that I chosen in A.

    asked by james on October 1, 2009
  5. College Chemistry

    1) The concentration of the aluminum ion in a test solution is 0.10M. Using the Ksp for aluminum hydroxide (3. x 10^-34), calculate the concentration of hydroxide needed to precipitate aluminum hydroxide. From the concentration of

    asked by Zach on April 1, 2010
  6. Chemistry

    When HCl(aq) is exactly neutralized by NaOH(aq), the hydrogen ion concentration in the resulting mixture is a. always equal than the concentration of the hydroxide ions b.sometimes greater and sometimes less than the concentration

    asked by Julia on April 20, 2010
  7. Chemistry

    If a solution of Ca(OH)2 has a pH of 12.31 how can I calculate the concentration of calcium hydroxide in mol L-1 ? Write the dissociation equation: Ca(OH)2 >>Ca+ + 2OH So the concentration of the OH ion is twice the Ca(OH)2 . Find

    asked by Fiona on May 21, 2007
  8. Chemistry

    1) find the hydronium ion concentration, the hydroxide ion concentration and the pH of a 0.000001 M solution of NaOH. 2) which of salts hydrolyze in aqueous solution : (NH4)2S, Na2So3,(CH3COO)2Ca? Write the ionic equationss for

    asked by Alper on April 16, 2018
  9. Chemistry

    My final exam is coming up so I am doing study guides to help me practice. I would really appreciate any help that is given. 1. The hydronium ion concentration for a solution is determined to be 4.5 x 10^-7 M. What is the

    asked by Studying on November 25, 2012
  10. Chemistry

    The hydronium ion concentration for a solution is determined to be 4.5 x 10^-7 M. What is the concentration of the hydroxide ion? I just wanted to let the people that are being nice enough to help me know that this is for a study

    asked by Amber on November 25, 2012

More Similar Questions