usor Periodic Table Incorrect Incorrect Incorrect The flask shown here contains

Question

usor Periodic Table Incorrect Incorrect Incorrect The flask shown here contains 0.450 g of acid and a few drops of phenolphthalein indicator dissolved in water. The buret contains 0.210 M NaOH. What volume of base is needed to reach the end point of the titration? Number 15.0 mL base Assuming the acid is monoprotic, what is its molar mass? Number 142.86 g mol nt r" ne ncorrect mL Reset 10 15 20 30 20 35 40 45 V Add base to the solution until it just turns pink. You may need to reset the titration if you go past the end point.

Explanation / Answer

vol of the base = 16 ml

no .of moles of base = 0.210*16*10^-3 = 0.00336

moles of acid required = 0.00336 moles

mol.wt = wt/no.of moles

mol.wt = 0.45/0.00336 = 133.93 gm /mol or 134 gm /mol

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