Sodium hydroxide is a strong base means that NaOH dissociates completely to Na (aq) and OH-(aq)
A strong base is a base that is completely dissociates in solution to yeild the hydroxide ion in high concentration.
Hence, the fact that sodium hydroxide is a strong base means that NaOH dissociates completely to Na (aq) and OH-(aq) when it dissolves in water.
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