You are Here: Home

# Chemistry Unit 4 Ph Help Please!! watch

1. Ph Quetion I Dont Know How To Do This Can Some One Please Help Me ??
Attached Images

2. ...well what is it?
3. (Original post by dee321)
yo, seriously what is it? lol
4. What exactly are you trying to do?

pH is an expression of the acidity of some solution - high pH = basic, low pH = acidic. It's the negative log (base 10) of the concentration of H+ in solution.
5. (Original post by Martinp23)
What exactly are you trying to do?

pH is an expression of the acidity of some solution - high pH = basic, low pH = acidic. It's the negative log (base 10) of the concentration of H+ in solution.
6. Definition is -log{10}[H+]
Pretty straightforward.
7. (Original post by Sockpirate)
...well what is it?
JUST ULPODED IT
8. (Original post by resortini)
yo, seriously what is it? lol
9. They react 1:1
Moles = conc x volume
get moles, then new volume and divide moles by the volume. This gives concentration of H+. -log{10} that to get the PH.
10. (Original post by xSkyFire)
They react 1:1
Moles = conc x volume
get moles, then new volume and divide moles by the volume. This gives concentration of H+. -log{10} that to get the PH.
SORRY I DONT GET IT CAN YOU DO IT TELL ME WHAT REACTATNT DO I NEED TO FIND THE CONCENTRATIONS AND VOILUMES OF PLEASE??
11. You Need To Find The Volume And Subsequently The Concentration Of The H+ Ions From The Acid. You Can Do This From Subtracting The Volume Of Naoh From Hcl As They React In A 1:1 Molar Ratio.
12. (Original post by gilbo)
You Need To Find The Volume And Subsequently The Concentration Of The H+ Ions From The Acid. You Can Do This From Subtracting The Volume Of Naoh From Hcl As They React In A 1:1 Molar Ratio.
CAN U PLEASE WRITE THE STEPS SORRY
13. moles of H+ = -
Concentration of H+ =
Ph =
14. Stop shouting!
I have sensitive ears...
15. (Original post by xarcul)
Stop shouting!
I have sensitive ears...
LOL you said what I was thinking. How do you do all caps anyway, it always changes mine to lower case.
16. slight alkali as this is in excess. looking forward to exam on wed morning??
17. First of all, stop the capitals.
Second HCl + NaOH -----> NaCl + H2O
One mole of HCl reacts with one mole of NaOH so work out how many moles of each reactant you have by using the formula Moles = Volume x Concentration
You have 0.025 moles of HCl and 0.02495 moles of NaOH.
The rectant react in a 1:1 mole ratio, so 0.02495 moles of each react, leaving just 5x10^-5 moles of H+.
Concentration of H+ is 5x10^-5 / 0.04995 = 1.001x10^-3
pH= -log10 [H+] = -log10 [1.001x10^-3] = 3.00

I think
18. lol, just realised it's multiple guess
They shoulda left the legacy spec the way it was
19. finallly got it thaks everyone yeeeeeeeeeeeeeeee

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 25, 2010
Today on TSR

### He lied about his age

Thought he was 19... really he's 14

### University open days

Wed, 25 Jul '18
2. University of Buckingham
Wed, 25 Jul '18
3. Bournemouth University