Explain why: If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.
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Distilled water, typically at pH 5.9, in contact with borosilicate glass, will result in the slow, temperature-dependent leaching of the main components of glass into the water. Increases in pH due to leaching, increases erosion rates. In decreasing order the composition of borosilicate glass consists of SiO2, CaO, Al2O3, B2O3 and MgO.
An equilibrium between dissolved (leachate) components and those remaining in the glass is set up eventually which means that more erosion takes place in a constantly replenished water supply than water in static contact.
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you are 9th std of icse ?
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