How to calcuate therotical pH
1.) 0.1 M HCl measured pH=1
2.) 0.1 M NaOH measured pH=13?
5 answers
I've responded to this also. If you can't find it I'll look and send you a link.
Hi, I don't think that's what my teacher wants
We did a lab experiement where for tube one used 9 drops of deionized water and places 1 drop of 0,1 M HCl measuring a pH= 1
2.In tube 3 used 9 drops of deionized water and placed 1 drop of 01M NaOH measuring a pH= 13
Not sure if this makes a differences he wants us to figure the dilution and pH
Unless I'm making this harder than it needs to be.
We did a lab experiement where for tube one used 9 drops of deionized water and places 1 drop of 0,1 M HCl measuring a pH= 1
2.In tube 3 used 9 drops of deionized water and placed 1 drop of 01M NaOH measuring a pH= 13
Not sure if this makes a differences he wants us to figure the dilution and pH
Unless I'm making this harder than it needs to be.
You didn't have any of that information in the first post and I'm not sure I understand what you want now. However, if you took 1 drop of 0.1 M HCl and diluted it with 9 drops of DI water the concn of HCl in the diluted solution is 0.1 M HCl x (1 drop/10 drops total) = 0.01 M HCl and you should have measured closer to a pH of 2 for the dilute solution and 1 for the initial solution.
Same comment about the diluted NaOH solution. It should be
(NaOH) = 0.1 M x (1 drop/10 drops total) = 0.01 M NaOH or pOH of 2 and you should have measured a pH of 12 for the diluted solution or 13 for the initial solution.
Did you use pH paper, universal indicator, or pH meter to measure the pH. Did you measure the pH of the diluted solution or the initial solution (or both)?
Same comment about the diluted NaOH solution. It should be
(NaOH) = 0.1 M x (1 drop/10 drops total) = 0.01 M NaOH or pOH of 2 and you should have measured a pH of 12 for the diluted solution or 13 for the initial solution.
Did you use pH paper, universal indicator, or pH meter to measure the pH. Did you measure the pH of the diluted solution or the initial solution (or both)?
Sorry. We were give a pH indicator where we put a drop of it in the HCl and NaOH where we were able to determine the pH because HCl was a red color while NaOH was a indigo/bluish color.
My teacher didn't go over theoretical calculate pH and its not in the book but he gave this to us to do over the weekend.
My teacher didn't go over theoretical calculate pH and its not in the book but he gave this to us to do over the weekend.
OK. My guess is that "theoretical pH) means to calculate what you think it should be based on the dilution of the original 0.1 M solutions. In that case you go with the 0.1 M HCl x (1/10) = 0.01 M HCl for HCl and theoretical pH of 2 and
0.1 M NaOH x (1/10) = 0.01 M NaOH for theoretical pH of 12.
The indicator you used probably was universal indicator and your prof probably wants you to see the difference between what those dyes measure and what you calculated. As measuring devices indicators are not as good as pH meters.
0.1 M NaOH x (1/10) = 0.01 M NaOH for theoretical pH of 12.
The indicator you used probably was universal indicator and your prof probably wants you to see the difference between what those dyes measure and what you calculated. As measuring devices indicators are not as good as pH meters.