How do you find the mass percent of oh- in an unknown

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How do you find the mass percent of OH- in an unknown sample of antacid size of 0.2274 g titrated with a 0.1M NaOH solution, endpoint being 29.5 mL. Not sure if relevant but 50mL of 0.1 HCl was added before titration. Show work with explanation please. 

Reference no: EM13971523

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How do you find the mass percent of oh- in an unknown : How do you find the mass percent of OH- in an unknown sample of antacid size of 0.2274 g titrated with a 0.1M NaOH solution, endpoint being 29.5 mL. Not sure if relevant but 50mL of 0.1 HCl was added before titration. Show work with explanation pleas..
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