Q1. α-D-Galactopyranose has [α]D = +150.7o, and β-D-galactopyranose
has [α]D = +52.8o. When either of them is dissolved in water and
allowed to reach equilibrium, the specific rotation of the solution will
be +80.2o. What are the percentages of each anomer at equilibrium?
I really have no ideal how to attempt this question but I will provide a
solution
150.7 + 80.2 = 230.9
150.7/ 230.9 * 100 % = 65.3%
52.8 + 80.2 = 133
52.8/133 * 100% = 40%
Right away, I know this answer is wrong because the percentages of the
two anomers do not add up to 100%.
Chemistry Homework Solutions
#14310
Specific rotation of glucose molecule (anomers)
Q1. α-D-Galactopyranose has [α]D = +150.7o, and β-D-galactopyranose has [α]D = +52.8o. When either of them is dissolved in water and allowed to reach equilibrium, the specific rotation of the solution will be +80.2o. What are the percentages of each anomer at equilibrium?
I really have no ideal how to attempt this question but I will provide a solution
150.7 + 80.2 = 230.9
150.7/ 230.9 * 100 % = 65.3%
52.8 + 80.2 = 133
52.8/133 * 100% = 40%
Right away, I know this answer is wrong because the percentages of the two anomers do not add up to 100%.
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