Why the walls of the flask are washed with de-ionised water during titration.how does this affect the outcomes of the titration?

The walls of the flask are washed with de-ionised water to ensure that all the solute from the walls is transferred into the solution being titrated. This ensures that the titration results are accurate and precise, as any solute left on the walls could skew the results by affecting the concentration of the solution being titrated.