Please provide an explanation as I have a test on this tomorrow and I will choose the best answer, thank you.
Identify each of the following as being true of acidic or basic solutions at 25 degrees celsius.
[H3O^+]=1 X 10 ^-3 M
[OH^-]= 1 X 10 ^-4 M
pH=5.0
pH=8.0
Identify each of the following as being true of acidic or basic solutions at 25 degrees celsius.
[H3O^+]=1 X 10 ^-3 M
[OH^-]= 1 X 10 ^-4 M
pH=5.0
pH=8.0
-
Stay with here on this, and re-read if you don't get it.
AND ALSO: [ H30+ = H+] its one and the same thing. also [ ] <-- these brackets mean concentration in molarity.
Acids and Bases are different because... acids in water give H+ ions, and in bases give OH- ions.
pH tells you the Hydrogen ion concentration for both acids and bases.
pH is measured on a scale of 0-14.
0-7 is acidic................. 7 is neutral.................. 7-14 is basic.
VERY IMPORTANT:
Its kinda odd to say that 0-7 is acidic because you would assume that more the pH which is more hydrogen ion concentration, higher the pH. But NO... because of the way pH is calculated.
pH is calculated by the molarity using this formula:
pH = -log10[H+].... it looks complicated but its not.. its basic math.
just plug in your concentration of H+ or H3O+.... and focus on the exponent.
That's the pH BUT JUST CHANGE THE SIGN TO +. In other words, remove the negative in the exponent. Good so far?
If you are given the OH= concentration, i.e, [OH-], then find the pOH, same thing again (bring the exponent down and make it positive!)
But ultimately you need to convert that into pH..
Just subtract it from 14............. because pH + pOH = 14.
So on the problems:
1. [H30+] = 1 * 10 ^ -3 M............. acidic.. because pH = 3... it falls within 0 - 7
2. [OH^-] = 1 X 10 ^ -4 M............. pOH = 4...........pH = 14 - pOH = 10.... basic
3. pH=5.0 .................................. its acidic..
4. pH=8.0 ................................... its basic...
:)
AND ALSO: [ H30+ = H+] its one and the same thing. also [ ] <-- these brackets mean concentration in molarity.
Acids and Bases are different because... acids in water give H+ ions, and in bases give OH- ions.
pH tells you the Hydrogen ion concentration for both acids and bases.
pH is measured on a scale of 0-14.
0-7 is acidic................. 7 is neutral.................. 7-14 is basic.
VERY IMPORTANT:
Its kinda odd to say that 0-7 is acidic because you would assume that more the pH which is more hydrogen ion concentration, higher the pH. But NO... because of the way pH is calculated.
pH is calculated by the molarity using this formula:
pH = -log10[H+].... it looks complicated but its not.. its basic math.
just plug in your concentration of H+ or H3O+.... and focus on the exponent.
That's the pH BUT JUST CHANGE THE SIGN TO +. In other words, remove the negative in the exponent. Good so far?
If you are given the OH= concentration, i.e, [OH-], then find the pOH, same thing again (bring the exponent down and make it positive!)
But ultimately you need to convert that into pH..
Just subtract it from 14............. because pH + pOH = 14.
So on the problems:
1. [H30+] = 1 * 10 ^ -3 M............. acidic.. because pH = 3... it falls within 0 - 7
2. [OH^-] = 1 X 10 ^ -4 M............. pOH = 4...........pH = 14 - pOH = 10.... basic
3. pH=5.0 .................................. its acidic..
4. pH=8.0 ................................... its basic...
:)