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Tuesday, April 30 th : “A” Day Wednesday, May 1 st : “B” Day Agenda. Homework questions/collect Finish section 15.2 Section 15.2 workday: Practice pg. 545: 1,2,4 Sec. 15.2 review, pg. 547: #1-12 Concept Review: “Acidity, Basicity, and pH” Quiz over section 15.2 next time…. - PowerPoint PPT Presentation
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Tuesday, April 30th: “A” DayWednesday, May 1st: “B” Day
AgendaHomework questions/collectFinish section 15.2Section 15.2 workday:
Practice pg. 545: 1,2,4Sec. 15.2 review, pg. 547: #1-12Concept Review: “Acidity, Basicity, and pH”Quiz over section 15.2 next time…
Measuring pH
We know how to calculate the pH from the [H3O+] or [OH-], but can we calculate the [H3O+] or [OH-], if we know the pH?
You bet your buttons we can!
Measuring pH
The pH equation may be rearranged to calculate the hydronium ion (H3O+) concentration from the pH.
[H3O+] = 10−pH
Sample Problem C, pg. 545Calculating [H3O+] and [OH-] from pH
What are the concentrations of the hydronium and hydroxide ions in a sample of rain water that has a pH of 5.05?
[H3O+] = 10−pH
[H3O+] = 10-5.05
[H3O+] = 8.91 X 10-6 MKw = [H3O+] [OH-] = 1.00 X 10-14
(8.91 X 10-6 M) [OH-] = 1.00 X 10-14
[OH-] = 1.12 X 10-9 M(3 sig figs)
Additional ExampleIf the pH of a solution is 8.1, what is [H3O+] in the
solution? What is the [OH-] in the solution?[H3O+] = 10−pH
[H3O+] = 10 –8.1
[H3O+] = 7.9 X 10-9 MKw = [H3O+] [OH-] = 1.00 X 10-14
(7.9 X 10 -9) [OH-] = 1.00 X 10-14
[OH-] = 1.3 X 10-6 M(2 sig figs)
Section 15.2 Workday
Practice pg. 545: #1,2,4Section 15.2 review: Pg. 547: #1-12Section 15.2 concept review: “Acidity, Basicity,
and pH”
Quiz over section 15.2 next time…