[Dirac]

In the lab, I use 2,4 g of fumaric acid in a basic solution of sodium hydroxide 3 mol/L , 2 g of sodium bromide (NaBr) and 1 mL of a solution of bromide (Br₂) to obtain 2,3-Dibromosuccinic acid.

In the manual says that the NaBr prevents the hydrolysis of the bromide. My question is.... why the NaBr prevents the hydrolysis?

Note: English is not my mother tongue, accept my apologize if the redaction of the question is awful

[Borek]

Le Chatelier's principle comes to mind.