"The most acidic natural inland waters are the lakes that lie in the craters of volcanoes, like Kawah Ijen in Indonesia.

Start by warming dilute sulfuric acid to 50 degrees Celsius ... of the required practical to prepare a pure, dry sample of a soluble salt from an insoluble oxide for GCSE chemistry and combined ...

It is important in this practical to: The acid and solid need to be chosen. Use hydrochloric acid to make a chloride, sulfuric acid to make a sulfate, and nitric acid to make a nitrate.

This acid is produced in a high-energy process whereby naturally occurring fluorspar (CaF 2) is reacted with concentrated sulfuric acid ... high stability and low solubility.

This acid is produced in a high-energy process whereby naturally occurring fluorspar (CaF 2) is reacted with concentrated sulfuric acid under very harsh conditions ... "The most challenging aspect of ...

Considering current efforts to prepare oxalic acid at a low cost from CO 2 and biomass, the method may become a viable alternative to the traditional sulfuric acid-dependent HF pathway.