A chemist prepares an aqueous solution of Ba(OH)2. When a calibrated pH sensor is immersed in the solution at 25 °C, the instrument records a pOH of 1.70.
(a) Explain, in words, the logical sequence of steps you would follow to determine the molar concentration of Ba(OH)2 from the recorded pOH value. Do not carry out any numerical calculations.
(b) Justify why the chemical formula of Ba(OH)2 must be taken into account when converting the hydroxide-ion concentration obtained from the pOH value to the concentration of the original solute.