Sodium hydrogen carbonate is a salt formed from the reaction between sodium hydroxide (a base) and carbonic acid (a weak acid). It is commonly known as baking soda and has a slightly alkaline nature. The pH of a 0.1 M solution of sodium hydrogen carbonate is around 8.3, indicating a basic solution.
On the other hand, hydroxide is the hydroxide ion, which is a strong base. When dissolved in water, it dissociates completely to form hydroxyl ions (OH-), resulting in a high pH value. Even dilute solutions of hydroxides, such as sodium hydroxide (NaOH), have a pH significantly greater than 7.
In summary, sodium hydrogen carbonate has a basic nature with a pH of around 8.3, while hydroxide represents a strong base with a pH much higher than 7. Therefore, sodium hydrogen carbonate does not have a lower pH than hydroxide.
