Both of these compounds are mined from the ground. They can be used directly without any further processing. Hereโs a picture of phosphate rock being mined from the ground. Phosphate rock has to be chemically processed before being used in fertilisers. We're going to look at how phosphate rock is treated with nitric acid, sulfuric acid, and phosphoric acid. This does contain a lot of detail and you do need to learn it.
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