disposal of phosphoric acid?

Answer 1

Are you asking how to dispose of it? For small quantities,
pour it on the ground near (but not in contact with) acid-loving plants like citrus trees or berry vines. It helps acidify the soil, and the resulting phosphates are good plant food. It's an ingredient in most cola drinks, so it's rather benign. Large quantities, or batches with significant impurities are another matter.

Answer 2

Phosphoric acid is a hazardous material and should be treated as such. It can be neutralized (carefully) with a base such as milk of magnesia. Local collection sites can take it. Just do not pour it on the ground or put it in a drain unless it is neutralized to a ph of 6-7.

Answer 3

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Ca3(PO4)2 + 3H2SO4 -> 2H3PO4 + 3CaSO4 This is a well known industrial method of producing phosphoric acid. disposal of the calcium sulphate is often a problem. P2O5 + 3H2SO4 → 2H3PO4 + 3SO3 This reaction demonstrates the very powerful dehydrating action of phosphorus pentoxide. It strips the water out of the sulphuric acid - which is in itself a very powerful dehydrating agent.

Answer 4

phosphoric acid is the stuff that turns rust into carbon.
it preps metal for painting. it can be neutralized easily with water.
the strength and quantity will determine where to put it. usually just add water and pour or spray on an alkali soil to sweeten it.

Answer 5

use a base to neutralize it.

i imagine you could then pour it down the drain?

Answer 6

if the container is in good shape, sell it on ebay!