The average molecular weight of the triglycerides in coconut oil is 680 g/mol. How much NaOH...

The average molecular weight of the triglycerides in coconut oil is 680 g/mol. How much NaOH (in grams) is required to completely saponify this oil? Why is it important to use less than this amount when preparing soap?

Solutions

Expert Solution

Molar mass of NaOH = At.mass of Na + At.mass of O + At.mass of H

= 23 + 16 + 1

= 40 g/mol

Given the everage mass of triglycerides is 680 g/mol

triglycerides + 3NaOH ---> Sodium salts of carboxylic acids + Glycerol

From the balanced equation ,

1 mole=680 g of triglycerides reacts with 3 mol = 3x40 g of NaOH of NaOH

= 120 g of NaOH

Therefore the amount of NaOH required is 120 g

queen_honey_blossom answered 1 year ago

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