× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
5
a
5
k
5
c
5
B
5
l
5
C
4
s
4
a
4
t
4
i
4
r
4
Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
New Topic  
linazss linazss
wrote...
Posts: 2
Rep: 0 0
11 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.
Read 911 times
4 Replies

Related Topics

Replies
liz
wrote...
#1
11 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
11 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
11 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
11 years ago
2) is your answer
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1330 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 292
  
 216
  
 2127
Your Opinion
Which industry do you think artificial intelligence (AI) will impact the most?
Votes: 352
Previous poll results: Which is the best fuel for late night cramming?