Why are acids kept in glass bottles not metal containers?

1. Reactivity: Many metals, such as iron, aluminum, and zinc, are reactive with acids. This reactivity can lead to the formation of hydrogen gas, which is flammable and can pose a safety hazard. Glass, on the other hand, is non-reactive and does not react with acids, making it a safer option for storage.

2. Corrosion Resistance: Acids are corrosive and can dissolve or damage many metals over time. Glass, being non-metallic, is resistant to corrosion and does not degrade when exposed to acids. This ensures the integrity and purity of the acids stored within.

3. Transparency: Glass bottles provide transparency, allowing for easy observation and monitoring of the acid inside. This is particularly important for identifying any changes in the acid's appearance, such as discoloration or cloudiness, which may indicate contamination or degradation.

4. Chemical Stability: Glass is chemically inert and does not release any ions or compounds that could potentially contaminate or react with the acids. This ensures the purity and quality of the acids stored in glass bottles.

5. Leak-proof Seal: Glass bottles can be sealed tightly to prevent leakage, minimizing the risk of spills and accidents. The use of appropriate stoppers or caps made from compatible materials further enhances the safety of acid storage.

6. Longevity: Glass bottles have a long lifespan and can withstand repeated use, making them a sustainable and cost-effective choice for acid storage compared to metal containers that may deteriorate over time.

It's important to note that not all types of glass are suitable for storing acids. Borosilicate glass, also known as Pyrex or borosilicate glass, is commonly used due to its high resistance to thermal shock, chemical corrosion, and temperature fluctuations.