7.57 If 0.561 g of KOH is dissolved in water to give 200 mL of solution at 298 K. Calculate the concentrations of potassium, hydrogen and hydroxyl ions.What is its pH?
We have 0.562 g of potassium hydroxide (). On dissolving in water gives 200 mL of solution.
Therefore, concentration of =
= 2.805 g/L
It is a strong base. So, that it goes complete dissociation.
It is known that,