Consider this reaction: 2H+ + CO32- → H2O + CO2. Identify each of the following as a product, a reactant, or a coefficient. CO32-:
H2O:
CO2:
The 2 in front of H+:

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.

it's c. elements are placed in rows based on how may valencies electrons have.

the volume increases

its first and third is your answer i did the qustion the fourth isnt right