April 20, 2014

Homework Help: chemistry - synthesis of aspirin

Posted by Priscilla on Saturday, April 7, 2012 at 8:32pm.

This is an experiment for a synthesis of aspirin lab

mass of salicylic acid = 2.005 g

mass of acetic acid = ?

moles of acetic acid = ?

volume of acetic anhydride = 4 ml

mass of acetic anhydride (Use 1.08 g/ml for the liquid density) = (1.08 g/ml)
(4 ml) = 4.32 g

moles of acetic anhydride (C4H6O3; molar mass = 102 g) = 4.32 g / 102 g = .042 mol

mass of filter paper = .196 g

mass of filter paper plus aspirin = 2.386 g

mass of weighing tray = 1.900 g

mass of filter paper, aspirin, and weighing tray = 4.286 g

mass of aspirin = 2.19 g

moles of aspirin (C9H8O4; molar mass = 180 g) = 2.19 g / 180 g = .012 mol

I understand now how to calculate the theoretical, actual and percent yield of aspirin. But I don't know how to calculate the mass of the acetic acid.

thank you for any help

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