Final answer:
A solution containing equal amounts of both enantiomers is called a racemic mixture. This 50:50 mixture of enantiomers is optically inactive.
Step-by-step explanation:
A solution containing equal amounts of both enantiomers is called a racemic mixture. In a racemic mixture, a chiral compound is mixed with its enantiomer, resulting in the diminished optical activity. This 50:50 mixture of enantiomers is optically inactive.