Practicing Density Calculations: A 4.80 gram piece of magnesium displaces 2.76 mL of water when it’s placed in a graduated cylin
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Answer:
α = -0,885°
Explanation:
The specific rotation [α] is defined as:
[α] = α/ c×l <em>(1)</em>
Where α is the observed rotation, c is concentration in g/mL, and l is optical path length in dm.
A racemic mixture has no optical activity. As the solution of (R)-2-butanol is mixed with an equal volume of the racemic mixture the concentration of the original solution decreases twice. That is 1,72M/2 =<em> 0,86M. </em>This concentration in g/mL is:
0,86mol/L××
= <em>0,0637 g/mL</em>
Replacing in (1):
<em>α = -0,885°</em>
I hope it helps!