Which is the strongest base?
[h+] = 10^-9
[h+] = 10^-11
[h+] = 10^-10
[h+] = 10^-12

The answer to your question is: [H+] = 10⁻¹²

Explanation:

Remember that pH = -log [H+], then, in this exercise we need to calculate the pH of the substances and compare the results, the one which the higher value will be the strongest base.

a) [H+] = 10^-9      pH = -log[10⁻⁹] = 8

b) [H+] = 10^-11     pH = -log[10⁻¹¹] = 10

c) [H+] = 10^-10     pH = -log[10⁻¹⁰] = 9

d) [H+] = 10^-12    pH = -log[10⁻¹²] = 11      This is the strongest base

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

the awnser is group 12