Posted by Monique on Sunday, November 6, 2011 at 7:43am.
500.0 mL x 0.200M = xmL x 15.0M(although you didn't write M).
Solve for x and I get 6.667 mL. In practice you add 6.667 ml of the 15.0M NaOH to a 500.0 mL volumetric flask and add water to the mark on the flask. Note that you DO NOT add 6.667 mL NaOH to 493.3 mL H2O.
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