17-10 Basic Anhydrides

What is the pH of the solution that is prepared by dissolving 0.62g of Na₂O in enough water to make 1.0L?

How many grams of Na₂O is needed to make a 1.0L solution that has a pH=13.0?

What is the pH of the solution that is prepared by dissolving 0.56g of CaO in the water to make 1.0L?

How many grams of CaO is needed to make a 1.0L solution that has a pH = 13.0?

If 100.0ml of the solution in Q4 is transferred to a 500.0ml container, and plenty water was added to fill it up, what is the pH of the solution?