What mass of water will
be produced from 2.70
moles of Ca(OH)2 reacting
with HCI?

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 is stable as it is in group 0 which have full outer shells of electrons

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