¿CO,R CH;OH CO,R + 3KOH→ CHOH + 3RCO,K „CO,R CH;OH

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25. An indlcation of the average formula weight of a fat is its saponification number, expressed asthe mlligrams KOH requlred to
hydrolyze (saponify) 1 g of the fat:
CH,CO,R
CH,OH
CHCO,R + 3KOH → CHOH + 3RCO,K
CH;CO,R
CH,OH
where R can be variable. A 1.10-g sample of butter is treated with 25.0 mL of 0.250 M KOH
solution. After the saponification is complete, the unreacted KOH is back-titrated with O.250 M
HCI, requiring 9.26 mL. What is the saponification number of the fat and what is its average
formula weight (assuming the butter is all fat)?
Transcribed Image Text:25. An indlcation of the average formula weight of a fat is its saponification number, expressed asthe mlligrams KOH requlred to hydrolyze (saponify) 1 g of the fat: CH,CO,R CH,OH CHCO,R + 3KOH → CHOH + 3RCO,K CH;CO,R CH,OH where R can be variable. A 1.10-g sample of butter is treated with 25.0 mL of 0.250 M KOH solution. After the saponification is complete, the unreacted KOH is back-titrated with O.250 M HCI, requiring 9.26 mL. What is the saponification number of the fat and what is its average formula weight (assuming the butter is all fat)?
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