- #1

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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?

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?