I would like to know what are the scientific evidences that baking soda is a good "shampoo" or substitute of the comercial shampoos?

In what way the baking soda works this miracle?

In what conditions the baking soda is applied to the hair? Is it in already dissolved in water or any other substance that reacts with the sodium bicarbonate (a.k.a baking soda) or it's applied as powder directly to the head?

Once in contact with water the sodium bicarbonate slowly turns into sodium bicarbonate, water and carbon dioxide (also known as CO2) but initially "boils" like hell releasing the CO2.
Check out the chemical reaction 2NaHCO3 → Na2CO3 + H2O + CO2


Now CO2 + H2O produces a weak acid. Would that acid be the answer ?

Which one of these three components does the magic? Which one eliminates the natural "oil" produced on the scalp ?

I'd appreciate some enlightment on this issue.