anonymous
  • anonymous
is the hydrogen ion concentration of a pH 3.8 solution higher or lower than that of a solution with a pH of 6.2?
Chemistry
chestercat
  • chestercat
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anonymous
  • anonymous
wait explaing that a bit more if you dont mind
Rogue
  • Rogue
pH = - log(based 10) [H+] [H+] = 10^(-pH)
Rogue
  • Rogue
Use the second to find your hydrogen ion concentrations, you'll observe that the one with the lower pH has more hydrogen ions.

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Rogue
  • Rogue
For the solution with a pH of 3.8, [H+] = 10^-3.8 = 1.58 x 10^-4 M For the solution with a pH of 6.2, [H+] = 10^-6.2 = 6.31 x 10^-7 M The solution with a pH of 3.8 has a higher hydrogen ion concentration.
anonymous
  • anonymous
how about if one solution has 100 times as many hydrogen ions as another solution, what is the difference, in pH units between the two solutions?
Rogue
  • Rogue
10 to the what power gives you 100? :P
anonymous
  • anonymous
2 :P
Rogue
  • Rogue
So heres another question if you wanna try it: If the pH of a solution is 8.5, what is the pH of a solution that has a 10000 times greater hydrogen concentration?
anonymous
  • anonymous
ok you got me but is the second question i asked you would that be 2 or negative 2?
Rogue
  • Rogue
It would be 2.
anonymous
  • anonymous
how so?
anonymous
  • anonymous
or how would i show work sorry if im being annoying i jus dont understand this topic
Rogue
  • Rogue
Its not your fault, I'm not really showing any work/explaining, sorry. Lets assume that solution A has a [H+] concentration greater than solution B. \[[H _{}^{+}]_{A}^{} = 10^{-pH _{A}^{}}\] \[[H _{}^{+}]_{B}^{} = 10^{-pH _{B}^{}}\]
Rogue
  • Rogue
If we divide the two equations, we get that \[[H _{}^{+}]_{A}^{} / [H _{}^{+}]_{B}^{} =10^{-pH _{A}^{} + pH _{B}^{}} = 100\]
anonymous
  • anonymous
ok i can see that
Rogue
  • Rogue
\[10^{-pH _{A}^{} + pH _{B}^{}} = 100\] Take the log based 10 of both sides:\[\log_{10}( 10^{-pH _{A}^{} + pH _{B}^{}} = 100)\] \[{-pH _{A}^{} + pH _{B}^{}} = 2\]
anonymous
  • anonymous
oh i see it now thanks! i am getting it a little now but if you dont mind i have about two other problems that need to be completed, but i dont exactly want you to do it for me but help me lead myself to an answer if you dont mind?
Rogue
  • Rogue
Sure, I'll help :)
anonymous
  • anonymous
alright thanks!!!!
anonymous
  • anonymous
if solution a contains 1 x 10^-6 MH+ ions and solution B contains 1 x 10^-8 MH+ ions, which solution contains more H+ ions
Rogue
  • Rogue
This question is just about your understanding of negative exponents I guess. Convert the numbers from scientific notation to standard notation to see which one is bigger.
anonymous
  • anonymous
ok dang i feel dumb now lol but do you know the relationship between hydrogen ion contrecations to the acidity and alklinity (basicity) of solution?
Rogue
  • Rogue
An easier way to do this problem would be to look at the pH's of each solution. If you look at the [H+] equation and compare it to the values they give, you'll notice that the first solution has a pH of 6 whilst the second has a pH of 8.
anonymous
  • anonymous
so would the ph of 6 be greater right?
Rogue
  • Rogue
Higher hydrogen ion concentration = lower pH = more acidity. Lower hydrogen ion concentration = higher pH = more basicity.
Rogue
  • Rogue
Yup, the pH of 6 has more...
anonymous
  • anonymous
awesome!!!!!!!!!!!
Rogue
  • Rogue
You'll get the hang of these problems after a while. Remember the key concepts and those two equations.
anonymous
  • anonymous
HA is an acid that ionizes 10% in a solution. what is the H+ of a 0.01 M solution of HA? what is its pH?
anonymous
  • anonymous
would the ph be 1 or 2?
anonymous
  • anonymous
oh and thanks again for all the help
Rogue
  • Rogue
If 10% of the 0.01 M is ionized, how much H+ are there?
anonymous
  • anonymous
um yeah now ya got me
anonymous
  • anonymous
-2?
Rogue
  • Rogue
10% of 0.01 M is just 0.001 M, so that is you H+ concentration. pH = - log [H+] = - log (0.001) = 3
Rogue
  • Rogue
pH is often positive by the way, unless your dealing with a strong acid, or a super concentrated solution.
anonymous
  • anonymous
so would 3 be the pH or the HA? or the amount of H+?
Rogue
  • Rogue
pH = 3, H+ = 0.001 M
Rogue
  • Rogue
HA is just some arbitrary acid, H is for the hydrogen an acid has, and A is for acid.
anonymous
  • anonymous
when did you lean all this stuff?
anonymous
  • anonymous
or where?!
Rogue
  • Rogue
Last year, took ap chem :)
anonymous
  • anonymous
like a boss!!!!
anonymous
  • anonymous
alright so in this next problem it seems like its working backwards what is the H+ of a solution whose pH is 8? what is the OH-?
Rogue
  • Rogue
Use these equations to help you: pH + pOH = 14 pH = - log [H+] pOH = - log [OH-] [H+] = 10^-pH [OH- ] = 10^-pOH
Rogue
  • Rogue
So for the first part, [H+] = 10^-8 M. For the second part, you get pOH = 6, so then [OH-] = 10^-6 M
Rogue
  • Rogue
I've got an ap bio final tomorrow, so I gotta go to sleep. Try to solve your problems using the equations I gave you, good luck! :D
anonymous
  • anonymous
alright good luck on your final and thanks!

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