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ID: 590311 • Letter: Y
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yout Reference Mailings Review View * A Aa - E.F.EE| 21 | A bct Abccc A XA-A-===2--Normal I No Spac. Heading1 Heading 2 Title Subt Font Paragraph Styles Table 1: Qualitative Observations Part A: Microscale Production of Acetylsalicylic -salicylic acid (C,H,O3 was liquid, clear, Acid (ASA) colourless CHO3 (ag + CHO C6H,049+ -acetic anhydride (C4H6O3 (9) was solid, powder, CH3COOH (as) white -solution of “impure" ASA + acetic acid contained white solute/precipitate; cloudy solution Part B: Isolation of ASA Crystals -white, crystal powder formed on filter paper | Part C: Melting Point of Synthesized ASA vs. | -crystals took very long time to melt Standard ASA -when melted (liquid), it was clear, colourless Part D: Impure ASA + Iron (III) Chloride -solution turned dark brown, dark purple Table 2: Measurements from Synthesis and Isolation of Pure ASA Mass of salicylic acid (g) 0.14 Mass of filter paper (g) 0.38 Mass of “impure" ASA and filter paper (g) | 0.50 Mass of prepared “impure" ASA (g) | 0.12 Melting point of prepared ASA (*C) 132.5 Melting point of standard ASA (*C) Table 3: Absorbance Readings of Standard ASA Sample Absorbance Reading 0 0 e 60 M N OExplanation / Answer
Actual yield = 0.12 gm
Now find out theoretical yield,
By looking at the number of moles it is clear that C7H6O3 is the limiting agent
1 mol of salicylic acid gives 1 mol of acetylsalicylic acid
1*10-3 mol of salicylic acid gives ? mol of acetylsalicylic acid (ASA)
cross multiply to get the answer,
1*10-3 mol of ASA
theoretical yield of ASA = 1*10-3 mol * 180.157 gm/mol = 0.180157 gms
% yield of pure ASA = (Actual yield / theoretical yield)*100 = (0.12/0.180157)*100 = 66.6085 %
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