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If the solution volume remains unchanged, the normality will decrease as the NaOH will react with CO2 present in the air.

Of course, if the solution volume is not held constant and if the evaporation rate is sufficient to concentrate the solution - it could also increase (effectively raising the normality of the remaining solution).

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11y ago
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Q: Will the normality of an NaOH solution increase or decrease if the solution is exposed to air for prolonged periods?
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