Malonic acid (HO₂CCH₂CO₂H) is a diprotic acid. In the titration of malonic acid with NaOH, stoichiometric points occur at pH = 3.9 and 8.8. A 25.00-mL sample of malonic acid of unknown concentration is titrated with 0.0984 M NaOH, requiring 31.50 mL of the NaOH solution to reach the phenolphthalein endpoint. Calculate the concentration of the initial malonic acid solution.

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Analyn TolentinoLv10

1 Dec 2020

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Potassium hydrogen phthalate, (KHC₈H₄O₄, molar mass = 204.2 g/mol) is a primary standard acid that reacts with sodium hydroxide in a 1:1 stoichiometric ratio. A sample of the acid weighing 0.4521 g was titrated with NaOH, requiring 22.61 mL to reach the endpoint. Calculate the molar concentration of the NaOH solution.

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raspberrywasp954

I need help on this problem please

A 0.210-g sample of an acid (molar mass = 192 g/mol) is titrated with 30.5 mL of 0.108 M NaOH to a phenolphthalein endpoint. Is the acid monoprotic, diprotic, or triprotic?