Dave is riding on a straight path. after 5 s, his speed is 3.0 m/s. after 7 s, his speed is 5.0 m/s. after 10 s, his speed was 7.0 m/s. what was his acceleration from 5 s to 10 s?

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.

i just learnt this recently but i need to look through my notes again