What is the K a of the acid used in the titration? For the titration above, the

Question

What is the Ka of the acid used in the titration?

For the titration above, the concentration of sodium hydroxide was standardized with potassium hydrogen phthalate.  It took 14.42 mL of the sodium hydroxide solution to reach the equivalence point with 0.6398 g of potassium hydrogen phthalate.  What is the concentration of the sodium hydroxide solution?

What is the volume of NaOH added at the equivalence point? and what is the pH at rquivalence point? do not include units with your answer. inlineImageLabel Prelab titration image.jpg What is the Ka of the acid used in the titration? For the titration above, the concentration of sodium hydroxide was standardized with potassium hydrogen phthalate. It took 14.42 mL of the sodium hydroxide solution to reach the equivalence point with 0.6398 g of potassium hydrogen phthalate. What is the concentration of the sodium hydroxide solution? In a different titration (not the one above), 1.328 g of an unknown monoprotic acid required 19.84 mL of 0.106 M sodium hydroxide to reach the equivalence point. What is the molar mass of the acid?

Explanation / Answer

a) Equivalent of NaOH = equivalent of potassium hydrogen phthalate = Mass/Equivalent weight

Equivalent wt. of potassium hydrogen phthalate = Molar mass / 1 = 204.2 g

vol * Normality = 0.6398/204.2 = 3.133 m.mole

Normality = 0.2173 N

For NaOH, n=1 Hence Molarity = Normality = 0.2173 M

b) Acid is monoprotic, n=1

Molar mass = equivalent mass = M

Equivalent of base = equivalent of acid

19.84*10^-3*.106 = 1.328 /M

M = 631.46 g

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