Making the Pharaoh's Serpent

TL;DR

Mercury thiocyanate is a highly toxic compound that was once used in fireworks, but banned due to its toxicity.

Transcript

Mercury is extremely toxic, and even just small amounts can be detrimental to wildlife. Mercury thiocyanate was discovered in 1821 in Germany. Soon after its discovery, it became a publicly available firework in Germany known as the pharaoh's serpent. However, it was eventually banned due to its highly toxic nature. The compound itself is a highly ... Read More

Key Insights

• 🎆 Mercury thiocyanate is a highly toxic compound that was once used in fireworks.
• ❓ The production process of mercury thiocyanate involves reacting potassium thiocyanate, elemental mercury, and concentrated nitric acid.
• ❓ Igniting mercury thiocyanate produces various toxic compounds, including mercury(II) sulfide, carbon disulfide, carbon nitride, and sulfur dioxide.
• 🫢 The snake-like shape of the combustion product is primarily made up of carbon nitride, which contains trapped gases and is highly contaminated with mercury.

Questions & Answers

Q: Why was mercury thiocyanate banned?

Mercury thiocyanate is highly toxic, so it was eventually banned due to the health risks it poses to humans and wildlife.

Q: What happens when you ignite mercury thiocyanate?

When ignited, mercury thiocyanate decomposes into mercury(II) sulfide, carbon disulfide, carbon nitride, sulfur dioxide, carbon dioxide, and nitrogen gas.

Q: How is mercury(II) nitrate formed in the production process?

Mercury(II) nitrate is formed when elemental mercury reacts with concentrated nitric acid. If dilute nitric acid is used, it would result in the formation of mercury(I) nitrate.

Q: How should the resulting ash and pieces of the snake be handled?

The resulting ash and pieces of the snake should be handled carefully due to their high mercury contamination. They should be placed in an appropriate mercury waste container.

Summary & Key Takeaways

• Mercury thiocyanate was discovered in Germany in 1821 and was used in fireworks known as the pharaoh's serpent.

• The compound is highly toxic and produces even more toxic compounds when combusted.

• The production of mercury thiocyanate involves reacting potassium thiocyanate and elemental mercury with concentrated nitric acid.