A certain lipid sample consists of a wax of unknown molecular weight and composition. It is known, however that the 2 groups are the same fatty acids. In order to investigate this, saponification and iodine numbers were used. A 3.000 g wax sample was placed under reflux with 20.00 mL of 0.7000 M KOH (56.1056 mg/mmol). It was then back-titrated using a 0.3500 M HCl titrant that required 23.91 mL to the phenolphthalein endpoint. To further characterize this, a 0.100 g sample was titrated for its iodine number. This consumed 3.50 mL of 0.100 N thiosulfate titrant. (Iodine: 126.905 g/eq) a) What is the saponification number of this wax sample? b) What is its Iodine number? c) How would you describe this in terms of unsaturation?
A certain lipid sample consists of a wax of unknown molecular weight and composition. It is known, however that the 2 groups are the same fatty acids. In order to investigate this, saponification and iodine numbers were used. A 3.000 g wax sample was placed under reflux with 20.00 mL of 0.7000 M KOH (56.1056 mg/mmol). It was then back-titrated using a 0.3500 M HCl titrant that required 23.91 mL to the phenolphthalein endpoint. To further characterize this, a 0.100 g sample was titrated for its iodine number. This consumed 3.50 mL of 0.100 N thiosulfate titrant. (Iodine: 126.905 g/eq) a) What is the saponification number of this wax sample? b) What is its Iodine number? c) How would you describe this in terms of unsaturation?
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ISBN:9781305957404
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![A certain lipid sample consists of a wax of unknown molecular weight and composition. It is known, however,
that the 2 groups are the same fatty acids. In order to investigate this, saponification and iodine numbers were
used.
A 3.000 g wax sample was placed under reflux with 20.00 mL of 0.7000 M KOH (56.1056 mg/mmol). It was
then back-titrated using a 0.3500 M HCl titrant that required 23.91 mL to the phenolphthalein endpoint.
To further characterize this, a 0.100 g sample was titrated for its iodine number. This consumed 3.50 mL of
0.100 N thiosulfate titrant. (Iodine: 126.905 g/eq)
a) What is the saponification number of this wax sample?
b)
What is its Iodine number?
c) How would you describe this in terms of unsaturation?
d) Given that it is a wax, what is the general structure of this lipid?
e)
What will be the MW factor for this lipid?
f) What is the average MW of the lipid?
g)
Given the table of molecular weights below, what is the possible identity of the wax?
Compound
MW (g/mol)
Stearic acid (18:0)
284.48
Octadecane (18:0)
254.51
Oleic Acid (18:1)
282.47
9-octadecene (18:1)
252.49
Linoleic Acid (18:2)
280.45
6,9-octadeca-diene (18:2)
250.47
a-Linoleic acid (18:3)
278.44
3,6,9-octadeca-triene (18:3)
248.45](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fde141e92-1ed9-422f-aaff-5ab711d31766%2Fb8a82944-ce4a-4b93-ab13-fa2eb0b7a611%2Fs7cp76_processed.png&w=3840&q=75)
Transcribed Image Text:A certain lipid sample consists of a wax of unknown molecular weight and composition. It is known, however,
that the 2 groups are the same fatty acids. In order to investigate this, saponification and iodine numbers were
used.
A 3.000 g wax sample was placed under reflux with 20.00 mL of 0.7000 M KOH (56.1056 mg/mmol). It was
then back-titrated using a 0.3500 M HCl titrant that required 23.91 mL to the phenolphthalein endpoint.
To further characterize this, a 0.100 g sample was titrated for its iodine number. This consumed 3.50 mL of
0.100 N thiosulfate titrant. (Iodine: 126.905 g/eq)
a) What is the saponification number of this wax sample?
b)
What is its Iodine number?
c) How would you describe this in terms of unsaturation?
d) Given that it is a wax, what is the general structure of this lipid?
e)
What will be the MW factor for this lipid?
f) What is the average MW of the lipid?
g)
Given the table of molecular weights below, what is the possible identity of the wax?
Compound
MW (g/mol)
Stearic acid (18:0)
284.48
Octadecane (18:0)
254.51
Oleic Acid (18:1)
282.47
9-octadecene (18:1)
252.49
Linoleic Acid (18:2)
280.45
6,9-octadeca-diene (18:2)
250.47
a-Linoleic acid (18:3)
278.44
3,6,9-octadeca-triene (18:3)
248.45
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