Saponification Data Table and Work Sheet
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D A T A T A B L E
Item Approx amt needed Amt used
(3 sig. figs.) Moles
Fat/Oil 10 g ±2 g (later)
KOH 5.6 g ±0.2 g
2.5 M HCl n.a. mL

D A T A T A B L E
Item	Approx amt needed	Amt used (3 sig. figs.)	Moles
Fat/Oil	10 g ±2 g		(later)
KOH	5.6 g ±0.2 g
2.5 M HCl	n.a.	mL

C A L C U L A T I O N S T A B L E
ITEM PROCESS Your numbers RESULT
Moles of soap made (moles KOH) - (moles HCl)
Moles of fat or oil (moles of soap) / 3
Moles of glycerol made equals moles of fat or oil
Molec Wt of fat or oil, MW (mass of fat or oil)/moles
Avg mol. wt of fatty acid, FA (MW - glycerol + 3)/3 =
(MW - 92 + 3)/3
Avg number C's per fatty acid 1 + ((FA - COO)/CH₂) =
1 + ((FA - 46)/14)
Note: Natural fatty acids have an even number of carbons!

C A L C U L A T I O N S T A B L E
ITEM	PROCESS	Your numbers	RESULT
Moles of soap made	(moles KOH) - (moles HCl)
Moles of fat or oil	(moles of soap) / 3
Moles of glycerol made	equals moles of fat or oil
Molec Wt of fat or oil, MW	(mass of fat or oil)/moles
Avg mol. wt of fatty acid, FA	(MW - glycerol + 3)/3 = (MW - 92 + 3)/3
Avg number C's per fatty acid	1 + ((FA - COO)/CH₂) = 1 + ((FA - 46)/14)
Note: Natural fatty acids have an even number of carbons!

Draw the structure of the fat or oil: