Question

What is the pH of baking soda?

Answer 1

Classification of solutions on basis of their pH

1. pH is a negative log of hydrogen ions. The pH value of any solution can be determined in aqueous or liquid form only.
2. The pH of any solution cannot be determined in solid or dry form it requires dissociation of ions as well. Thus, an aqueous solution is needed to obtain its pH value.
3. The pH of acids is less than 7.
4. The pH of bases is more than 7.
5. The pH of neutral solutions is 7 which is neutral.

1. When Carbonic acid ${\mathrm{H}}_2{\mathrm{CO}}_3$and Sodium hydroxide$\mathrm{NaOH}$ is reacted they form Baking soda ${\mathrm{NaHCO}}_3$which is salt and water. This type of reaction is known as a neutralization reaction. ${\mathrm{H}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)+\mathrm{NaOH}\left(\mathrm{aq}\right)\to {\mathrm{NaHCO}}_3\left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$
2. Baking soda or Sodium Bicarbonate (${\mathrm{NaHCO}}_3$) when dissolved in water, its pH value lies between 8 to 9. The value of pH depends on the concentration of solute ( Sodium bicarbonate) taken in solvent (water) and also whether any other acid or base is added to its solution to modify the pH.
3. When baking soda is dissolved in water, a negatively charged bicarbonate (${{\mathrm{HCO}}_3}^{-}$ ) and a positively charged Sodium ion (${\mathrm{Na}}^{+}$) dissociate and tend to float freely in the water.
4. Sodium bicarbonate is a basic salt that can be used as a pH buffering agent and also used to increase the pH value and thus, make any solution alkaline.
5. Higher temperature shifts the equation to the right, slightly increasing the carbonate to bicarbonate ratio. At the same time, the acid (H⁺) concentration increases slightly which causes a slight drop in pH.