The student identifies two of the amino acids as alanine and serine - AQA - A-Level Chemistry - Question 2 - 2021 - Paper 3
Question 2
The student identifies two of the amino acids as alanine and serine.
Use Figure 3 to calculate the R value of the unknown amino acid. Show your working.
Use your ... show full transcript
Worked Solution & Example Answer:The student identifies two of the amino acids as alanine and serine - AQA - A-Level Chemistry - Question 2 - 2021 - Paper 3
Step 1
Calculate R value of the unknown amino acid
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Answer
To calculate the R value for the unknown amino acid, we use the formula:
R=distance traveled by the solvent frontdistance traveled by the amino acid
From Figure 3, the distance traveled by the unknown amino acid is approximately 0.34 cm, and the total distance traveled by the solvent front is 1.0 cm.
Therefore,
R=1.00.34=0.34
Step 2
Identify the unknown amino acid
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Answer
From Table 1, the R value of 0.34 corresponds to the amino acid glycine.
