# Tuesday, April 30 th : “A” Day Wednesday, May 1 st : “B” Day Agenda

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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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<ul><li><p>Tuesday, April 30th: A DayWednesday, May 1st: B DayAgendaHomework 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 pHQuiz over section 15.2 next time</p></li><li><p>Measuring pHWe know how to calculate the pH from the [H3O+] or [OH-], but can we calculate the [H3O+] or [OH-], if we know the pH?</p><p>You bet your buttons we can!</p></li><li><p>Measuring pHThe pH equation may be rearranged to calculate the hydronium ion (H3O+) concentration from the pH. </p><p>[H3O+] = 10pH</p></li><li><p>Sample Problem C, pg. 545Calculating [H3O+] and [OH-] from pHWhat are the concentrations of the hydronium and hydroxide ions in a sample of rain water that has a pH of 5.05?[H3O+] = 10pH[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)</p></li><li><p>Additional ExampleIf the pH of a solution is 8.1, what is [H3O+] in the solution? What is the [OH-] in the solution?[H3O+] = 10pH[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)</p></li><li><p>Section 15.2 WorkdayPractice 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</p></li></ul>