In your words, what is the purpose of a chemical equation?

Chemical equations show how chemicals interact when a reaction occurs.

Chemical equations use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out.

Chemical equations help keep track of all elements and the number of atoms of each element on each side of the equation.

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.