Ester Hcl
Calculate the% w / w ethyl acetate, a product containing ethyl acetate?
The esters are determined jointly by 'saponification with a measured quantity of standard basis: for example, ethyl acetate saponified with CH3COOCH2CH3 Potassium hydroxide + OH -> CH3COO-+ CH3CH2OH A 3.423 g sample of a commercial product containing ethyl acetate is saponified by reflux with 50.00 mL of 0.500 mol / L KOH. Following hydroxide excess reflux is back titrated with 0.3866 mol / L standard HCl, requiring 36.17 mL. Calculate the% w / w ethyl acetate. really need help and development so that I can understand thatnks
50 ml of KOH 0.5 M KOH = 25 mmol. 36.17ml of 0.3866 M HCl = 13.98 mmol HCl (KOH = 13.98 mmol) The difference of 11 mmol of KOH was used in the reaction saponification. If the reaction equation above is true (part 1 OH (-) to 1 part ethyl acetate), we know that there is 11 mmol of the ester as a commercial product. The molecular weight of ethyl acetate is 88.11 g / mol-1 [http://de.wikipedia.org/wiki/Ethylacetat]. 11mmol are thus 88.11 g / mol x 11 mmol = 969 mg = 0.969 g% w / w = 0.969 gx 100 / 3.423 = 28.31 g% Looks reasonable. But recalculate better!
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