Question

prepare a standard solution of NaOH. The concentration is approximately 2.5M, the volume(amount of the solution to be made) is 1.5L, and the moles mass of NaOH is 40g/mol. How much of the NaOH do you need to add to 1.5L of water to prepare a standard solution of 2.5M NaOH? show all the work

Answer 1

molarity of NaOH = M= 2.5M

Volume of solution = V = 1.5L

Molar mass of NaOH = M.w = 40 g/mole

Molarity = number of moles NaOH/volume

Number of moles = Molarity xVolume

                           = 2.5 x 1.5 = 3.75 moles

Number moles of NaOH = 3.75 moles

Number of moles = Mass/molar mass

Mass= Number of moles x molar mass

Mass = 3.75 x 40 = 150 grams

Mass of NaOH required = 150 grams.