Why does adding acid decrease the pH value, and adding alkali increase the pH value?

Question

Accepted Answer

The pH value decreases when acid is added and increases when alkali is added.

Acids release hydrogen ions (H+) when dissolved in water, which increases the concentration of H+ ions and lowers the pH value.
Alkalis release hydroxide ions (OH-) when dissolved in water, which decreases the concentration of H+ ions and raises the pH value.
The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 are acidic, and values above 7 are alkaline.
For example, adding lemon juice (acidic) to water will lower the pH value, while adding baking soda (alkaline) will increase the pH value.

Accepted Answer

Adding acid will decrease the pH valve. Adding Alkali will increase the pH

Accepted Answer

When an acid is added to an alkali, the reaction that takes place lower the pH of the alkali. When an acid reacts with an alkali the pH of both solutions moves towards 7. Since a solution with a pH of 7 is neutral, the type of reaction which takes place is called neutralisation.

Accepted Answer

Using acid lowers both the pH and alkalinity in water. It lowers pH at the expense of alkalinity because you need more dissolved carbon dioxide in water to lower pH. Since acid does not contain CO2, it converts carbonate (CO3--) and bicarbonate (HCO3-) alkalinity into carbonic acid (H2CO3) by adding Hydrogen ions (H+).

Accepted Answer

Maintenan the solution of ph is effect of retention time of hplc

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Why does adding acid decrease the pH value, and adding alkali increase the pH value?

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