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<h2>HL Paper 3</h2><div class="specification">
<p><span style="background-color: #ffffff;">Aspartame is formed from the two amino acids aspartic acid (Asp) and phenylalanine (Phe).</span></p>
</div>
<div class="specification">
<p><span style="background-color: #ffffff;">Chromatography is used in the analysis of proteins in the food and pharmaceutical industry.</span></p>
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<div class="question" style="padding-left: 20px; padding-right: 20px;">
<p><span style="background-color: #ffffff;">Draw the structure of the dipeptide Asp–Phe using section 33 of the data booklet.</span></p>
<div class="marks">[2]</div>
<div class="question_part_label">a.</div>
</div>
<div class="question" style="padding-left: 20px; padding-right: 20px;">
<p><span style="background-color: #ffffff;">Describe, using another method, how a mixture of four amino acids, alanine, arginine, glutamic acid and glycine, could be separated when placed in a buffer solution of pH 6.0.</span></p>
<div class="marks">[3]</div>
<div class="question_part_label">b(i).</div>
</div>
<div class="question" style="padding-left: 20px; padding-right: 20px;">
<p><span style="background-color: #ffffff;">Suggest why alanine and glycine separate slightly at pH 6.5.</span></p>
<div class="marks">[1]</div>
<div class="question_part_label">b(ii).</div>
</div>
<div class="question" style="padding-left: 20px; padding-right: 20px;">
<p><span style="background-color: #ffffff;">Calculate the ratio of [A<sup>−</sup>] : [HA] in a buffer of pH 6.0 given that p<em>K</em><sub>a</sub> for the acid is 4.83, using section 1 of the data booklet.</span></p>
<div class="marks">[1]</div>
<div class="question_part_label">b(iii).</div>
</div>
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