Metals tend to lose valence electrons and form a positively charged ion equal to the American group number in which they are found. Thus, of the
ions listed below, does NOT seem to have the correct charge.
a) K+
b) Sr2+
c) A13+
d) Ral+

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Explanation:

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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.

the answer is c i believe