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I have a 500mL flask, and I want to prepare 500mL of NaOH solution with a pH of 13.00. How many grams of Na OH do I need to put in the flask to arrive at this pH?

  • Chemistry -

    pH = 13. Convert to pOH from
    pH + pOH = pKw = 14
    Then convert OH^- from
    pOH = -log(OH^-).
    OH^- will give you moles/L. YOu want 500 mL so you want half of that number of moles. Then moles = grams/molar mass. You know moles and molar mass NaOH, solve for grams. Something close to 2.0 g perhaps.

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