vera_ewing
  • vera_ewing
What is the pH of a 0.025 M solution of NaOH? A. 2.50 B. 1.60 C. 12.40 D. Cannot determine without the Kb of NaOH
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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vera_ewing
  • vera_ewing
@taramgrant0543664
Photon336
  • Photon336
0.025 = [OH] [OH][H+] = 1x10^-14 (1x10^-14)/(0.025) = 4x10^-13 -log(4x10^-13) =12.4
taramgrant0543664
  • taramgrant0543664
For this one you solve the same way that you normally would and add an extra step at the end since it's OH To start we use the formula: pOH=-log[OH] =-log(0.035) =1.602 Since it's asking for pH and not pOH we just do a simple subtraction: pH=14-pOH =14-1.602 =12.398

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vera_ewing
  • vera_ewing
Thank you! That makes so much more sense now! :)
taramgrant0543664
  • taramgrant0543664
No problem!!
Photon336
  • Photon336
Explanation: You're given the concentration of OH- which you need to use to find the pH pH = -log(H) which p means take the -log of something. At 25 degrees Celsius you know that the [H][OH] = 10^-14 so if you know the concentration of one you know the concentration of the other.

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