The concentration of ethyl alcohol in a typical molecular cloud is one molecule per 108 cubic meters. What is the volume of a cloud you would need to make a martini (10 grams)? The molecular weight of a ethyl alcohol is 46 which means that an Avogadro number (6 x 1023) of molecules weighs 46 grams.

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.

that tool would be a compass