Posted by pal on Tuesday, March 29, 2011 at 9:39pm.
HCO3^- + OH^- ==> H2O + CO3^-2
You start with 50.0 mL x 0.56M NaHCO3 = 28 mmoles.
You add 50.0 mL x 0.400M NaOH = 20 mmoles.
So you must end up with 20 mmoles Na2CO3, 0 mmoles NaOH, and 8 mmoles NaHCO3.
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