Question

Calcium hydroxide, Ca(OH)2, is used as a calcium nutritional supplement in some foods and beverages, such as orange juice. What is the pH of a solution of 0.0012M calcium hydroxide at 25.0∘C?

Answer 1

pH = 11.38

Step-by-step explanation:

The pH of a solution is given as:

pH = pKw − pOH = 14.00 + log[OH-]

Since the concentration of Ca(OH)2 is 0.0012 M, the [OH−] is twice that, or 0.0024 M, resulting in pOH = 2.62 and pH = 11.38.