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. 👁 240
  1. Calculate pOH from pOH = -log(OH^-).
    Then pH + pOH = pKw = 14.

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

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

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

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

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

    1. 👍 0
    2. 👎 0
  12. perfect! 4.79

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

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    A is a solution of trioxonitrate(v) acid, HNO3, of unknown concentration. B is standard solution of sodium hydroxide containing 4.00g per dm3 of solution. 25cm3 portions solution B required an average of 24.00cm3 of solution A for

  2. 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

  3. Chemistry

    In a lab, we added NH3(aq) to CuSO4(aq), and the solution turned dark blue with a precipitate. The problem is that the products ( Cu(NH3)4 and SO4) should be soluble, no? The question is then, what is the percipitate? The ppt is

  4. Chemistry

    A is a solution of trioxonitrate (v)acid, HNO3 of unknown concentration.B is standard solution of sodium hydroxide containing 4.00g per dm3 of solution. 25 cm3 portion solution B required an average of 24.00cm3 of solution A for

  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

  2. chemistry

    Calculate the hydroxide ion concentration of a solution with pH = 8.25.

  3. 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

  4. Chemistry

    A is a solution of trioxonitrate (V) acid. HNO of unknown concentration B is standard solution of sodium hydroxide containing 4.00g per dm3 of solution 25cm3 portion solution B required an average of 24.00cm3 of solution A for

  1. Chemistry

    The concentration of propionic acid (CH3CH2COOH) solution was found to be 5.0 x 10^2 M, at 25 degree Celsius. (Ka for propionic acid is; 1.34 x 10^5, Kw= [H+][OH-]= 1 x 10^14) Calculate, A) Hydrogen (H+) ion concentration, ([H3O+]

  2. CHEMISTRY

    A is a solution of trioxonitate acid of an unknown concentration, B is a standard solution of sodium hydroxide containing 4.00g per dm3 of solution 25cm3 portion of solution B require an average of 24cm3 of solution A for complete

  3. Chemistry

    In a saturated solution of silver phosphate, the concentration of silver ion is 4.5 x 10^-4 mol/L. The Ksp of silver phosphate would be which of the following? 6.8  10-8 1.0  10-11 1.4  10-14 none of the above 1.5 

  4. Science

    5. You have made the following two solutions: X) hydrogen ion concentration = 1 x 10-5M Y) pH = 4 State which statements below are true and which are false: a. Solution X contains 1 x 10-9M hydroxide ions. b. Solution X contains

You can view more similar questions or ask a new question.