Food Analysis - Iodine Value of Lipids Prac

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Total cards: 19•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (19)

Front (Question)

Iodine value?

Back (Answer)

degree unsaturation

Front (Question)

Iodine value of olive oil?

Back (Answer)

79 - 88

Front (Question)

Iodine value of beeswax

Back (Answer)

8 - 11

Front (Question)

Iodine is not absorbed from aqueous sol’n - what do?

Back (Answer)

• use sol’n of iodine monochloride (ICl)

Front (Question)

Wij’s soln

Back (Answer)

ICl dissolved in Chloroform + glacial acetic acid

Front (Question)

What was the percentage of oil per 100 mL chloroform soln?

Back (Answer)

3 %

Front (Question)

Molarity of Na2SO3

Back (Answer)

.1000

Front (Question)

X =

Back (Answer)

blank titration in mL

Front (Question)

y =

Back (Answer)

titration in presence of fat in mL

#10

Front (Question)

Back (Answer)

number of grams of oil per 100 g

#11

Front (Question)

how many moles of S2O3 reacts with iodine?

Back (Answer)

#12

Front (Question)

What do you put in the three erlenmeyer flasks?

Back (Answer)

two contain 15 mL of the lipid sample, and one contains a 15 mL chloroform blank. All three contain (after addition) 25 mLs of Wij’s sol’n

#13

Front (Question)

After adding Wij’s - what do?

Back (Answer)

Cover flasks with parafilm & mix - place in dark cupboard for hour

#14

Front (Question)

After 1 hour?

Back (Answer)

add 10 mL of 10% KI and distilled water to make vol to 100 mL

#15

Front (Question)

Titrate with?

Back (Answer)

.1000 M Na2SO3

#16

Front (Question)

Titrate to?

Back (Answer)

Pale yellow colour

#17

Front (Question)

How many drops of starch added?

Back (Answer)

4 - 5 drops

#18

Front (Question)

What colour after starch?

Back (Answer)

Blue

#19

Front (Question)

End point following addition of starch?

Back (Answer)

colourless