What amount of NaOH should be dissolved in a 500 mL solution, so that the p ^ H of solution is 12 at 298 K ?

Step-by-step solution

Given pH = 12 pOH = 14 - 12 = 2 [ OH ⁻] = 10⁻² M Since NaOH is a strong base, the concentration of NaOH is 10⁻² M . Volume of the solution V = 500 mL = 0.5 L Number of moles of NaOH = M V = 10⁻² 0.5 = 0.005 mol Molar mass of NaOH = 40 g/mol Amount of NaOH required = 0.005 40 = 0.2 g Answer: 0.2 g