1 .What is a compound
2. what is compound composed of

Compound means the mixing of two substances in any ratio

Explanation:

Compound is composed of two or more substances

1, a thing that is composed of two or more separate elements;

2,

chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.