Making Lithium Peroxide

TL;DR

Lithium peroxide is a powerful oxidizing agent that reacts with CO2 to purify air, and its low molecular weight makes it useful in spacecraft.

Transcript

Lithium peroxide is a strong oxidizing agent with the formula Li2O2. It readily reacts with CO2 in the air and for this reason it's commonly used as an air purifier. Unlike other CO2 scrubbers it has a very low molecular weight which makes it particularly useful in spacecraft. On top of this it also has the added benefit of releasing oxygen gas. To... Read More

Key Insights

• 🫢 Lithium peroxide is a strong oxidizing agent used for air purification and can release oxygen gas.
• ❓ The preparation of lithium peroxide involves mixing hydrogen peroxide and lithium hydroxide.
• 😘 The yield of the synthesis process was 52%, lower than the advertised yield of 83%.
• 🏆 A peroxide test can be used to confirm the presence of lithium peroxide.
• 🫢 Lithium peroxide can react with CO2 and maintain a flame longer, indicating the production of oxygen gas.
• 😪 Flame tests show the characteristic crimson red color of lithium.
• ❓ Lithium peroxide does not react strongly with organic solvents.

Questions & Answers

Q: How does lithium peroxide function as an air purifier?

Lithium peroxide reacts with CO2 in the air, releasing oxygen gas and purifying the air.

Q: What chemicals are used to prepare lithium peroxide?

The preparation involves using 35% hydrogen peroxide and lithium hydroxide, which react to produce lithium hydroperoxide.

Q: What is the yield of the lithium peroxide preparation?

The yield of the synthesis was 52%, which is slightly lower than the advertised yield of 83% in a patent.

Q: How can lithium peroxide be tested for its presence?

A simple peroxide test can be conducted using a test solution containing potassium iodide and glacial acetic acid, which produces a color change when lithium peroxide is added.

Summary & Key Takeaways

• Lithium peroxide is commonly used as an air purifier due to its ability to react with CO2 and release oxygen gas.

• The preparation of lithium peroxide involves mixing hydrogen peroxide and lithium hydroxide, which produce lithium hydroperoxide.

• The hydroperoxide is then converted to lithium peroxide through heating under a vacuum.