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Why sodium hydroxide bottle is kept opened in laboratories?

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NaOH bottle is not kept open in labs nor is NaOH stored in bottles with glass stoppers. NaOH is hygroscopic. It reacts with CO2 from air to Na2CO3 (also NaHCO3) by the reaction: 2NaOH(aq) + CO2(g) -> Na2CO3(s) + H2O(l). read more

NaOH bottle is not kept open in labs nor is NaOH stored in bottles with glass stoppers. NaOH is hygroscopic. It reacts with CO2 from air to Na2CO3 (also NaHCO3) by the reaction: 2NaOH(aq) + CO2(g) -> Na2CO3(s) + H2O(l). read more

Sodium can react vigorously with atmospheric oxygen at room temperature to form sodium dioxide. During the reaction of sodium large amount of heat is released . So to prevent the reaction of sodium and to preserve it mercury is used which prevents sodium to come in contact with air and thus it is preserved and stored. read more

Standardized Sodium Hydroxide (NaOH), as most laboratory chemicals should be stored in a sealed bottle to avoid evaporation of the Water portion, which in turn would increase the concentration of the NaOH over time. (this can be observed experimentally by placing a drop of the NaOH(aq) solution on a safe surface and allowing it to evaporate. read more

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