Answer:
<h2>

</h2>
Step-by-step explanation:
25 - 32 = -7 and 18 - 25 = -7
It means an arithmetic sequence with common difference d = -7

Answer:
Step-by-step explanation:

POH is the -log [ OH- ]. Using this equation, simply find the -log of the OH- concentration to find the pOH:
pOH = - log ( 0.000086 ) = 4.07
Answer:
A is the answer.
Step-by-step explanation:
3.2 x 10-9 = 23.
All the other answers are more than 23.