1.During the lab, a step was used to decompose the excess ethanoic anhydride. Wr
ID: 631075 • Letter: 1
Question
1.During the lab, a step was used to decompose the excess ethanoic anhydride. Write the balanced reaction equation for the reaction used to decompose the excess ethanoic anhydride.
2.Calculate the minimum volume of water that is needed to decompose all the excess ethanoic anhydride. Recall: 1.0 g of H2O = 1.0 mL of water, for this purpose.
Explanation / Answer
1) CH3-(CO)-O-(OC)-CH3 + H2O -> 2CH3COOH , 2) ethanoic anahydride used = 3+2.5 = 5.5 ml = 5.5 x1.082 = 5.95 gm , moles = 5.95/102.09 = 0.0583 , lest 1.8 gm salycilic acid is used = 1.8/138.12 = 0.013 , excess moles of anahydride = ( 0.0583-0.013) = 0.0453, moles of water required to react with excess anhydride = 0.0453, mass of water = 0.0453 x18 = 0.8154 gm = 0.8154 ml
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