What is the h+ concentration for an aqueous solution with poh = 4.01 at 25 ∘c? express your answer to two significant figures and include the appropriate units.

I believe pH = -log[H+]

Also, 14 = pH + pOH

Therefore pH = 14 - pOH

pH = 14 - 4.01

pH = 9.99

9.99 = -log[H+]

Solve for H+

Crystal structure is not an essential characteristic of any mineral.

Explanation:

The substance which have some distinct characters like they are naturally occuring,inorganic compound,which is solid in structure and have difinite chemical composition and ordered internal structure.

Naturally occuring because mineral is found naturally.

They are inorganic because the substance is made by any living organism  and are found in solid but not found in gas or liquid form

Different minerals have different chemical composition with a specific orderly arranged internal structure.

Example-Rock salt ( halite)