Work Step by Step
Mass of NaOH = Volume in litres$\times$Molarity$\times$Molar mass = 0.250 L$\times$ 0.400mol/L $\times$ 39.997 g/mol = 4.00 g
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.