Rochelle's salt is:

Assertion (A) : Rochelle's salt is used as a complexing agent in Tollens reagent. Reason (R ) . Sodium potassium salt of tartaric acid is known as Rochelle's salt. The IUPAC name of Rochelle's salt is sodium potassium-2,3-dihydroxy butance-1,4- diote.

Assertion (A) : Rochelle's salt is used as a complexing agent in Tollens reagent. Reason (R ) . Sodium potassium salt of tartaric acid is known as Rochelle's salt. The IUPAC name of Rochelle's salt is sodium potassium-2,3-dihydroxy butance-1,4- diote.

Rochelle salt is one of the components of the following reagent

What is the function of Rochelle salt in Fehling's solution ?