I am trying to make my own alkaline water using baking soda and distilled water. First I measure out 0.018 moles of baking soda as follows (0.25 tsp)(1ml/.202 tst)(1.2 grams NaHCO3/ml)(1 mole NHCO3/1 gram NaHCO3) = .018 moles NaHCo3 I measure out 0.236 liters of distilled water i.e. 1 cup. The molarity of the NaHCO3 is not M= 0.018 moles NaHCO3/0.236 liters of water = 0.076 The pOH of the solution is –log(0.076) = 1.12 thefore the pH is 14 – 1.12 = 12.88. Note: the molarity of [OH] should be the same as the molarity of NaHCO3. However, when I put ¼ tsp baking soda into as cup of distilled water the pH measures only 8.0. What is wrong here? Is the baking soda not disassociating?