Map sapling learning mL Reset The flask shown here contains 1.47 g of acid and a

Question

Map sapling learning mL Reset The flask shown here contains 1.47 g of acid and a few drops of phenolphthalein indicator dissolved in water. The buret contains 0.300 M NaOH 20 25 30 15 What volume of base is needed to reach the end point of the titration? 20 Number 30 35 40 45 mL base Assuming the acid is monoprotic, what is its molar mass? Add base to the solution until it just turns pink. You may need to reset the titration if Number g/mol you go past the end point. Previous Give Up & View Solution O Check Answer Next Exit Hint

Explanation / Answer

m = 1.47 g of acid

M = 0.3 M of NaOH

V = 26 if you read the meniscus

therefore 26-0 = 26 ml have been used

find concnetration of acid

M = mol/V

note that concnetration of base = concnetratino of acid in the final solution so

Macid = Mbase

0.3 M of HA

M*V

0.3*26 ml = 7.8 mmol of acid

MW = mass/mol = 1.47g / (7.8*10^-3) mol = 188.5 g/mol

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