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Homework Help: What is the pH when 200 mL 0.1 M NaOH is mixed with 300 mL water?

  1. Jan 23, 2014 #1
    What is the pH when 200 mL 0.1 M NaOH is mixed with 300 mL water?

    I am stuck here. I know V1C1 = V2C2 but I need help at this point. I don't know how NaOH reacts with water, and how this would affect the pH of the final solution. I also don't know whether or not I should use the Henderson-Hasselbalch equation. Thank you in advance for your help!
  2. jcsd
  3. Jan 23, 2014 #2


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    Staff: Mentor

    What is pH of the 0.1 M NaOH?
  4. Jan 23, 2014 #3


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    What reaction? 0.1M NaOH is a sodium hydroxide solution. It's already mixed with some water. What happens to the concentration of a solution when you add more water?
  5. Jan 23, 2014 #4
    What is the OH ion concentration after you add the 300 ml of water? What is the product of the OH ion concentration and the H ion concentration? What is the H ion concentration. What is the pH?
  6. Jan 23, 2014 #5
    Thank you all!
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