Who told you the correct answer is 7.00? That isn't right.
Reason through it.
Low pH means high pOH (since pH + pOH = 14) and that means high H^+. So for high OH^- we want a high pH which means a low pOH and that is a high OH^-. If you don't like that method, go through and calculate the concn of OH^- for each.
For example,
pH = 7.93. pOH = 6.07. OH^- = 8.5E-7
Another.
pH = 7.00. pOH = 7.00. OH^- = 1.00E-7
Another.
pH = 3.21. pOH = 10.79. OH^- = 1.62E-11
Note that for these three examples I've done, pH 7.93 has a higher OH than the other two, (including pH = 7.00).
which solution has the highest concentration of hydroxide ions?
a ph=7.93
b ph=12.59
c ph=7.00
d ph=9.82
e ph=3.21
i know the answer is 7 but why is it seven? would it be different if it said hydronium ions?
5 answers
oh, i see, it was a question on my chem test that i got wrong, the answer sheet said 7. this teacher is always giving questions with wrong answers, its very frustrating.
1 x 10-3 is bigger than 8,5 x10-3 so ph of 7 is right as it have high concetration of OH ions
No im wrong vice versa ph of 7.93 is right sorry
Wouldn’t it be 12.6 since thats the highest concentration
1 answer