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Question

How is the concentration of hydroxide ions (OH-) affected when excess base is dissolved in a solution of Sodium hydroxide?


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Solution

Base:-

  • Substances that produce hydroxide ions(OH-)when dissolved in water are called a base.
  • More the concentration of the hydroxide ion is, the more the basicity of the substance is.
  • Some examples are- Sodium hydroxide(NaOH), Calcium hydroxideCa(OH)2

Affect of addition of excess base:-

  • In the solution of Sodium hydroxide(NaOH), if a base is added, it increases the concentration of hydroxide ions(OH-).
  • Also the Sodium hydroxide itself dissociates to give out hydroxide ions.

NaOH(aq)SodiumhydroxideNa+(aq)Sodiumions+OH-(aq)Hydroxideions

  • Hence the concentration of hydroxide ions in the solution increases per unit volume.

Therefore, the concentration of hydroxide ions (OH-) increases per unit volume, when excess base is dissolved in a solution of Sodium hydroxide(NaOH)


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