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As for Hydrochloric Acid, it is was also used by a 13th-century European Alchemist Pseudo Geber who developed aqua regia by mixing hydrochloric acid and nitric acid. Aqua regia has the ability to dessolve most noble gasses, gold, and platinum. Aqua regia was used by the Hungarian chemist George de Hevesy when Germany invaded Denmark during WWII to melt the Nobel Prizes of German physicists Max von Laue and James Franck to keep the Nazis from obtaining the gold. De Hevesy hid the solution in the Niels Bohr Institute as the Nazis overlooked the solution that was kept in a jar. After the war, De Hevesy took the untouched solution and re-cast the medals. In Europe during the Industrial Revolution, a new industrial process by Nicolas Leblanc created a large-scale production of sodium carbonate. As sulfuric acid, limestone and coal were combine, an excess waste of hydrogen chloride was released. in 1863, British Alkali Act required the hydrogen chloride gas to no longer be vented out, but absorbed into water. As it was absorbed into water, it produced hydrochloric acid at industrial scale. The act that was enabled began the introduction of large scale acid development.
In the project of the indicator sponge, NaOH (Sodium Hydroxide) is used as a strong base to change the colors of the sponge after being dipped in HCI. Sodium Hydroxide is not only influential, but also in the development and history of food. Food being close to culture, Sodium Hydroxide influenced culture by helping develop foods. For example, the Scandinavian delicacy lutefisk and the Pinoy which is a Filipino desert. Sodium Hydroxide is also used in the production of Century eggs by gelling egg whites. Century eggs has occurred 600 years ago in Hunan in the Han Dynasty. These Century eggs influence culture in Hunan as it was part of its cultural food. Even though when it was discovered in the Han dynasty, it was discovered as a duck egg found in a pool of slaked lime, it is still recreated throughout history and today with Sodium Hydroxide. Overall, Sodium Hydroxide has been a big influence in history of culture through aiding in the production of cultural foods.
Sodium Hydroxide was also used to detect carbon monoxide poisoning. This aided in the development of health and technology within society. Blood samples of the patient would have his/her blood taken then with a few drops of sodium Hydroxide, if the blood changed into a vermilion color, then it signified monoxide poisoning. When this was developed, it helped in diagnosing illnesses and showed an advance in knowledge and technology as people developed a way to use chemicals in health.
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