Conquer the 2026 NANTeL Chemistry Challenge – Engineering Fundamentals Unleashed!

Arrhenius bases are substances that, when dissolved in water, increase the concentration of hydroxide ions (OH−) in the solution. This occurs because they dissociate to release OH−, as in sodium hydroxide: NaOH → Na+ + OH−. The key trait is the production of OH−, which makes the solution basic. The option stating an increase in H+ concentration would define an Arrhenius acid, not a base. While bases can neutralize acids to form salts, the defining feature here is the creation of hydroxide ions in solution.