Understanding Normality and Molarity
* Normality (N): Represents the number of equivalents of a solute per liter of solution. For NaOH, one mole contains one equivalent of hydroxide ions (OH-).
* Molarity (M): Represents the number of moles of a solute per liter of solution.
In the case of NaOH:
* Since one mole of NaOH contains one equivalent of OH-, the normality and molarity of NaOH solutions are numerically equal.
* Therefore, a 1N NaOH solution is also a 1M NaOH solution.
Hydroxide Ion Concentration
* NaOH completely dissociates in water: NaOH(aq) → Na+(aq) + OH-(aq)
* This means that for every mole of NaOH dissolved, one mole of OH- ions is produced.
Conclusion
Since a 1N NaOH solution is equivalent to a 1M NaOH solution, the hydroxide ion concentration [OH-] is 1 M or 1 mol/L.
