Why is concentrated sulphuric acid kept in airtight bottles?

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G Prasad

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Generally 98% Sulphuric acid is called as concentrated sulphuric acid. Sulphuric acid is highly hygroscopic i.e it will attract water molecules immediately from its vicinity. If kept open then it will absorb moisture from atmosphere and its concentration will change and it may no longer have the exact...
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Generally 98% Sulphuric acid is called as concentrated sulphuric acid. Sulphuric acid is highly hygroscopic i.e it will attract water molecules immediately from its vicinity. If kept open then it will absorb moisture from atmosphere and its concentration will change and it may no longer have the exact acid to water ratio. Second reason is for safety. As concentrated H2SO4 is highly corrosive, if it spills over then the damage might be irreparable. Third reason is vaporisation. Sulphuric Acid is not very volatile but still keeping it open can lead to loss of fumes. For all the above reasons, concentrated sulphuric acid is stored in airtight bottles. read less
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20 years of teaching experience

Sulphuric acid has a very high affinity for water. If allowed to stand in the open air, it will absorb moisture from the atmosphere, which will affect its concentration. If it is not kept in airtight bottle and it is knocked over, the resulting spill will cause a lot of damage.
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Abhishek S ( M.Pharm.MBA) tutor for IB/International/IGCSE

Reaction with air, causes it to react with oxygen, and Nitrogen, hence reducing purity and causing a fizz.
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Pioneer in CBSE IXth and Xth Tuitions

It will react with atmospheric moisture vigorously, to avoid that we have to keep it in closed container
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Professional Chemistry Teacher for IIT JEE/NEET UG,Online expert for IB/IGCSE/AP CURRICULUM

Firstly extra pure conc H2SO4 is powerful dehydrating agent and exposure to air may result in absorption of moisture and can cause uneven expansion,generates heat leading to exothermic reaction causing sudden cracks in container and may lead to explosion....Secondly,spilling of H2SO4 may cause blister's...
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Firstly extra pure conc H2SO4 is powerful dehydrating agent and exposure to air may result in absorption of moisture and can cause uneven expansion,generates heat leading to exothermic reaction causing sudden cracks in container and may lead to explosion....Secondly,spilling of H2SO4 may cause blister's on skin and britting of surface of stone and so on.... read less
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Sulphuric acid has a very high affinity for water. If allowed to stand in the open air, it will absorb moisture from the atmosphere, which will affect its concentration.
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Headstart to assured 95+ score in math

It reacts readily with moisture. And that is exothermic; it gives heat. Avoid it by keeping in airtight bottles.
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"Read , Recall and Procure"

The first answer is safety. If the bottle is not stoppered and it is knocked over, the resulting spill will cause a lot of damage. Secondly, allowing the acid to stand in open air will allow contaminants, such as dust, to fall into the acid and taint its composition. Thirdly, sulphuric acid has...
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The first answer is safety. If the bottle is not stoppered and it is knocked over, the resulting spill will cause a lot of damage. Secondly, allowing the acid to stand in open air will allow contaminants, such as dust, to fall into the acid and taint its composition. Thirdly, sulphuric acid has a very high affinity for water. If allowed to stand in the open air, it will absorb moisture from the atmosphere, which will affect its concentration. read less
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Math Educator for Std.11th ,12th , Engineering Entrance and Degree Level with 11+ Years Experience

Concentrated sulphuric acid is a hygroscopic in nature. If kept open it absorbs moisture from air and its concentration get change. Hence it is kept in air tight bottles to prevent it from contact of moisture.
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M.Sc Chemistry SET qualified, Chemistry Lecturer with 5 years of Teaching Experience

Concentrated sulphuric acid has a very high affinity to wards water that why it can absorb moisture(water) from the atmosphere which leads to dilution to the concentration.
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