Question

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?

Answer 1

wait explaing that a bit more if you dont mind

Answer 2

pH = - log(based 10) [H+]
[H+] = 10^(-pH)

Answer 3

Use the second to find your hydrogen ion concentrations, you'll observe that the one with the lower pH has more hydrogen ions.

Answer 4

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.

Answer 5

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?

Answer 6

10 to the what power gives you 100? :P

Answer 7

2 :P

Answer 8

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?

Answer 9

ok you got me but is the second question i asked you would that be 2 or negative 2?

Answer 10

It would be 2.

Answer 11

how so?

Answer 12

or how would i show work sorry if im being annoying i jus dont understand this topic

Answer 13

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.
\[[H _{}^{+}]_{A}^{} = 10^{-pH _{A}^{}}\]
\[[H _{}^{+}]_{B}^{} = 10^{-pH _{B}^{}}\]

Answer 14

If we divide the two equations, we get that \[[H _{}^{+}]_{A}^{} / [H _{}^{+}]_{B}^{} =10^{-pH _{A}^{} + pH _{B}^{}} = 100\]

Answer 15

ok i can see that

Answer 16

\[10^{-pH _{A}^{} + pH _{B}^{}} = 100\]
Take the log based 10 of both sides:\[\log_{10}( 10^{-pH _{A}^{} + pH _{B}^{}} = 100)\] \[{-pH _{A}^{} + pH _{B}^{}} = 2\]

Answer 17

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?

Answer 18

Sure, I'll help :)

Answer 19

alright thanks!!!!

Answer 20

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

Answer 21

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.

Answer 22

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?

Answer 23

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.

Answer 24

so would the ph of 6 be greater right?

Answer 25

Higher hydrogen ion concentration = lower pH = more acidity.
Lower hydrogen ion concentration = higher pH = more basicity.

Answer 26

Yup, the pH of 6 has more...

Answer 27

awesome!!!!!!!!!!!

Answer 28

You'll get the hang of these problems after a while. Remember the key concepts and those two equations.

Answer 29

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?

Answer 30

would the ph be 1 or 2?

Answer 31

oh and thanks again for all the help

Answer 32

If 10% of the 0.01 M is ionized, how much H+ are there?

Answer 33

um yeah now ya got me

Answer 34

-2?

Answer 35

10% of 0.01 M is just 0.001 M, so that is you H+ concentration. pH = - log [H+] = - log (0.001) = 3

Answer 36

pH is often positive by the way, unless your dealing with a strong acid, or a super concentrated solution.

Answer 37

so would 3 be the pH or the HA? or the amount of H+?

Answer 38

pH = 3, H+ = 0.001 M

Answer 39

HA is just some arbitrary acid, H is for the hydrogen an acid has, and A is for acid.

Answer 40

when did you lean all this stuff?

Answer 41

or where?!

Answer 42

Last year, took ap chem :)

Answer 43

like a boss!!!!

Answer 44

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-?

Answer 45

Use these equations to help you:

pH + pOH = 14
pH = - log [H+]
pOH = - log [OH-]
[H+] = 10^-pH
[OH- ] = 10^-pOH

Answer 46

So for the first part, [H+] = 10^-8 M. For the second part, you get pOH = 6, so then [OH-] = 10^-6 M

Answer 47

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

Answer 48

alright good luck on your final and thanks!