How many grams of NaOH is required to make 250 cm³ solution of 0.025 M NaOH solution?

•  0.025 M NaOH solution which means that 0.025 moles of NaOH are present in 1 L of solution.
• 1000 cm³ 0.025 M NaOH solution contains NaOH = 0.025 mol.
• 250 cm³ 0.025 M NaOH solution contains NaOH = (0.025/1000) x 250 mol = 0.00625 mol
• The molar mass of NaOH is 40 g/mol.

Hence, the mass of 0.00625 moles of NaOH = 0.00625 x 40 g = 0.25 g