Increasing the volume of the solution decreases the concentration of the hydrogen ions which subsequently increases the pH; hence, increasing volume will increase the pH.
Higher is the concentration of H plus ions, more acidic is the solution and lower the concentration of H plus ions, the less acidic is the solution. Basic strength of a solution depends on the concentration of OH minus ions.
When an acid and alkali react together, they produce salt and water. Acid + alkali → salt + water . As you know, water is neutral, so the acid alkali come together to neutralize each other to make pH 7.
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