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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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linazss linazss
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12 years ago
(1) pH 1 to pH 2
(2) pH 1 to pH 3
(3) pH 2 to pH 1
(4) pH 3 to pH 1

Please explain, I don't understand how to do this. I know the pH formula is -log10 [H+], but I don't know about Hydronium.
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liz
wrote...
#1
12 years ago
pH = - log[H3O+] (log base 10)
every 10 times dilution of an acid the pH is increased by one unit.since log 10 = 1
(4) is correct pH 3 to pH 1 the [H3O+] ion concentration increased by 100 times.
wrote...
#2
12 years ago
"H+" doesn't exist as such in water - H3O+ (the hydronium ion) is present.  And we often represent this ion as "H+(aq)".  So it's strictly this ion that is referred to in pH calculations, but for the sake of saving a moment's time we regularly write [H+].

A pH change of 2 corresponds to a change of a hundredfold in the concentration of "H+(aq)" so the answer you're looking for is (4), from a pH of 3 to a pH of 1.
wrote...
#3
12 years ago
Correct answer = 3 ie pH2 to pH1
pH = -log{H+] Hence [H+] = 10^-pH

For pH2, [H+] = 10^-2 = 0.01
For pH1 [H+] = 10^-1 = 0.10
wrote...
#4
12 years ago
2) is your answer
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