How is the concentration of hydroxide ions (OH–) affected when excess
base is dissolved in a solution of sodium hydroxide?
Numa HussainMaster
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How is the concentration of hydroxide ions (OH–) affected when excess
base is dissolved in a solution of sodium hydroxide?
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When excess base is dissolved in a solution of sodium hydroxide, the concentration of hydroxide ions (OH-) increases. This is because the excess base reacts with the sodium hydroxide to produce more hydroxide ions.
Sodium hydroxide (NaOH) is a strong base that dissociates completely in water, producing equal concentrations of Na+ and OH- ions. When additional base is added to the solution, such as potassium hydroxide (KOH), it reacts with the sodium ions to produce more hydroxide ions.
For example, if excess KOH is added to a solution of NaOH, the KOH dissociates into K+ and OH- ions, and the OH- ions react with the Na+ ions to produce more NaOH and additional OH- ions. The result is an increase in the concentration of OH- ions and a more basic solution.