The APsolute RecAP: Chemistry Edition - pH and pOH
02/22/21 • 10 min
We are starting with a recap of episode 35 and are defining acids and bases and their connection to pH and pOH (1:02). Taking a closer look at the pH scale, our episode discusses the use of logarithm for pH and pOH (1:53). This lays the foundation for the calculation of pH and pOH for strong acids and bases. For weak acids and bases the episode draws the connection back to equilibrium and introduces the acid/base ionization constant (3:10), which is needed together with the initial concentrations to calculate the pH of a weak acid/base (6:08).
Question: You have a 0.1 M sulfurous acid solution. If at equilibrium you have a [H+] = 8.4 x 10-3 M, what is the percent ionization?
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(AP is a registered trademark of the College Board and is not affiliated with The APsolute RecAP. Copyright 2021 - The APsolute RecAP, LLC. All rights reserved.)
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We are starting with a recap of episode 35 and are defining acids and bases and their connection to pH and pOH (1:02). Taking a closer look at the pH scale, our episode discusses the use of logarithm for pH and pOH (1:53). This lays the foundation for the calculation of pH and pOH for strong acids and bases. For weak acids and bases the episode draws the connection back to equilibrium and introduces the acid/base ionization constant (3:10), which is needed together with the initial concentrations to calculate the pH of a weak acid/base (6:08).
Question: You have a 0.1 M sulfurous acid solution. If at equilibrium you have a [H+] = 8.4 x 10-3 M, what is the percent ionization?
Thank you for listening to The APsolute RecAP: Chemistry Edition!
(AP is a registered trademark of the College Board and is not affiliated with The APsolute RecAP. Copyright 2021 - The APsolute RecAP, LLC. All rights reserved.)
Website:
EMAIL:
Follow Us:
Previous Episode
The APsolute RecAP: Chemistry Edition - Acids and Bases - The Basics
We start our recap with a recap: What are acids and bases and acid-base reactions (1:03)? Diving a bit deeper, we take a closer look at the dissociation of acids (2:20), which releases H+ ions and therefore lowers the pH. Vice-versa we look at the dissociation of bases in water (3:34 ) and it’s connection to pOH and pH (3:34). Taking a closer look at water, which is an amphoteric substance (4:16), the episode introduces the autoionization of water (5:56) and the equilibrium constant: KW (6:35) and ties it to pH and pOH (7:29).
Question: At a higher temperature, will the pH of a neutral solution be higher, lower or equal to pH=7?
Thank you for listening to The APsolute RecAP: Chemistry Edition!
(AP is a registered trademark of the College Board and is not affiliated with The APsolute RecAP. Copyright 2021 - The APsolute RecAP, LLC. All rights reserved.)
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Next Episode
The APsolute RecAP: Chemistry Edition - Acid-Base Titrations
Acid-base titrations are an experimental approach to determine the concentration of an unknown acid or base (0:56). Your episode starts by introducing the terms analyte and titrant (1:49) and looks at two examples: In the first example, we are titrating a strong acid with a strong base (2:03). We describe the shape of the titration curve (2:14) and define equivalence point (2:44), the point at which the number of moles of titrant and number of moles of analyte are the same. Using the equivalence point, we can calculate the molarity of the unknown analyte (3:03). The second example outlines the titration of a weak acid with a strong base (4:26) and describes why the equivalence point is at a pH higher than 7 (5:19). It also discusses the half-equivalence point (6:00), which can be used to determine the pKa of the weak acid.
Question: How many equivalence points will the titration curve of a diprotic acid show?
Thank you for listening to The APsolute RecAP: Chemistry Edition!
(AP is a registered trademark of the College Board and is not affiliated with The APsolute RecAP. Copyright 2021 - The APsolute RecAP, LLC. All rights reserved.)
Website:
EMAIL:
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