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

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.

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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