Kemmi Major tests a sample of phosphoric acid, H3PO4, with a concentration of 1.
ID: 852454 • Letter: K
Question
Kemmi Major tests a sample of phosphoric acid, H3PO4, with a concentration of 1.0M. She measures 10.0mL of the acid in 100 mL graduated cylinder, and adds a drop of phenolphthalein. Predict how much 1.0M NaOH base will be added to just neutralize the acid (when the indicator turns pink). Round answer to 3 significant figures in units of mL. Kemmi Major tests a sample of phosphoric acid, H3PO4, with a concentration of 1.0M. She measures 10.0mL of the acid in 100 mL graduated cylinder, and adds a drop of phenolphthalein. Predict how much 1.0M NaOH base will be added to just neutralize the acid (when the indicator turns pink). Round answer to 3 significant figures in units of mL.Explanation / Answer
Milliequivalents of phosphoric acid = N X V = 3 X M X V = 10 X 3 X 1 = 30 milli equival of phosphoric acid
so we need 30 milli equivalents of NaOH to completely neutralize it
Thus volume of NaOH required of given conc = 30 mL
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