Question

Prepare 0.25M NAOH solution of 100 ml

Answer 1

Answer:

Molar mass of NaOH = 40 g/mol.

1 L 0.25M NaOH solution contains 0.25×40 = 10 g NaOH.

Weigh 10 g NaOH bead. Pour it in a volumetric flask of 1 L containing some water in it. Add water with constant stirring, make up the volume with water up to the mark.

* NaOH bead absorbs water from air while weighing. So, the prepared solution will not be accurate. To prepare NaOH solution of accurate strength, you may follow the following method. Take slightly more amount of NaOH as calculated, prepare the solution of approximate strength, then titrate with a exact strength of oxalic acid solution. You will get the strength of NaOH solution. Then using dilution equation you can prepare your desired solution.