I need help with question b a) Lysine is an essential amino acid. It is taken by some people as a nutritional supplement inthe form of a hydrated crystalline solid with the formula C6H14N2O2.xH₂O . To control the dose oflysine, it is essential to know the complete formula of the hydrate, which means determining thevalue of x.To determine the value of x in lysine hydrate, a pharmacist used a direct titration method. Shedissolved 6.258g of the compound in approximately 100mL of distilled water and then madethis up to 250mL in a volumetric flask. She then titrated 25mL aliquots of this solution with astandardized NaOH solution of concentration 0.1050 mol dm-3, obtaining a mean titre of 36.30mL. In titrations, lysine behaves as a monoprotic acid.Use these data to determine the value of x in lysine hydrate.b) In a second experiment to verify the value of x, the pharmacist heated a 3.752g sample of thelysine hydrate to drive off all the water. When she reweighed the sample, the mass was 3.278 g.Use this data to obtain another value for x.c) What is the most likely reason why the value of x obtained in the second experiment does notexactly agree with the value form the first experiment?

Given, mass of sample of lysine hydrate =3.752 g mass of sample after heating = 3.278 g

b) In a second experiment to verify the value of x, the pharmacist heated a 3.752g sample of the lysine hydrate to drive off all the water. When she reweighed the sample, the mass was 3.278 g. Use this data to obtain another value for x.

b) In a second experiment to verify the value of x, the pharmacist heated a 3.752g sample of the lysine hydrate to drive off all the water. When she reweighed the sample, the mass was 3.278 g. Use this data to obtain another value for x.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter3: Chemical Reactions

Section3.10: Solution Concentration: Molarity

Problem 3.23E

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Question

I need help with question b

a) Lysine is an essential amino acid. It is taken by some people as a nutritional supplement in
the form of a hydrated crystalline solid with the formula C6H14N2O2.xH₂O . To control the dose of
lysine, it is essential to know the complete formula of the hydrate, which means determining the
value of x.
To determine the value of x in lysine hydrate, a pharmacist used a direct titration method. She
dissolved 6.258g of the compound in approximately 100mL of distilled water and then made
this up to 250mL in a volumetric flask. She then titrated 25mL aliquots of this solution with a
standardized NaOH solution of concentration 0.1050 mol dm-3, obtaining a mean titre of 36.30
mL. In titrations, lysine behaves as a monoprotic acid.
Use these data to determine the value of x in lysine hydrate.
b) In a second experiment to verify the value of x, the pharmacist heated a 3.752g sample of the
lysine hydrate to drive off all the water. When she reweighed the sample, the mass was 3.278 g.
Use this data to obtain another value for x.
c) What is the most likely reason why the value of x obtained in the second experiment does not
exactly agree with the value form the first experiment?

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