Before Class on Feb. 22

Our learning objectives for Wednesday are:

–Understand the relationship between Ka for a weak acid and Kb for its conjugate base.

–Describe the acid base properties of salts, and calculate the pH of a solution of a salt of a weak acid or a weak base

Before class on Feb. 22:

  • Please watch the video below (28 min);
  • Complete the notes; and
  • Make a comment.

https://www.youtube.com/watch?v=1-B8OOLPHtU

 

 

 

This entry was posted in AP Unit 9 Acid and Base Equilibrium, Uncategorized. Bookmark the permalink.

4 thoughts on “Before Class on Feb. 22”

  1. In this video, i learned about the relationship between the acid dissociation constant and the base dissociation constant. At 25 degrees Celcius, Ka x Kb is the same as Kw (1 x 10^-14) and pKa + pKb is the same as pKw is the same as 14.When salts dissolve in water there are certain properties that determine if the solution becomes more acidic, more basic, or neutral. Conjugate acids of strong bases are not expected to react with water, nor are conjugate bases of strong acids. The stronger the original acid/base, the weaker its conjugate is. Metals with high charges such as Fe+3 react with water to form an acidic solution. Knowing this, we can examine the cation and anions in a salt to see what teh solution becomes when it is dissolved in water. If the sat has an anion and a cation that doe not react in water, then the solution will be neutral. If it contains a cation that reacts with water to form OH-, but the anion still doesn’t react, then the solution will become more basic. If the opposite is true, and the anion reacts with water to form H+, but the cation does not react, then the solution becomes more acidic. If both cation and anion react, then the outcome is determined more on a case by case basis. It can be more acidic or more basic, depending. Thank you!

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  2. In this video, we learned about the relationship between Ka and Kb and that we can fine the value of one if we know the value of the other because the product of Ka and Kb equals the value of Kw. We also learned about the combines effect of cations and anions in solutions and how we can use them to figure out if a solution is more acidic, more basic, or remained neutral.

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  4. In this video, I learned about the relationship between Ka and Kb, and how it related to the equation for the ionization of water and its Kw. I also learned about the Acid and Base properties of salt solutions and their combined effects in determining whether a solution will become more basic or acidic if that salt is dissolved in water.
    Question: If a cation is the conjugate acid of a strong base, then will it react with water?

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