HCl (6M) is added to the Grignard's mixture because it is important to convert the left over Grignard reagent.
An organo-magnesium halide having a formula of RMgX, where X is a halogen (-Cl, -Br, or -I), and R is an alkyl or aryl (based on a benzene ring) group is known as a Grignard reagent. For initiating a Grignard Reaction, a Grignard reagent is added to a ketone or aldehyde, to form a tertiary or secondary alcohol.
HCl (6M) is important to quench the left over Grignard reagent and to convert that Na⁺ into less soluble product as we don't want low pH.
Learn more about Grignard Reaction from the link given below.
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