How many moles of hydrofluoric acid, HF, must be added to 500.0 mL of 0.25 M sodium

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How many moles of hydrofluoric acid, HF, must be added to 500.0 mL of 0.25 M sodium fluoride to give a buffer of pH 3.50? Ignore the volume change due to the addition of hydrofluoric acid.
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General Chemistry

ISBN: 978-1439043998

9th edition

Authors: Darrell Ebbing, Steven D. Gammon

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