p H p OH calculations Titration Calculations Chemistry

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p. H, p. OH calculations Titration Calculations Chemistry 5/29/15

p. H, p. OH calculations Titration Calculations Chemistry 5/29/15

Drill l Drano is mainly sodium hydroxide. The [OH-] is often around 0. 35

Drill l Drano is mainly sodium hydroxide. The [OH-] is often around 0. 35 M. Calculate the p. H, p. OH, and [H+] HW: Finish Acids and Bases Review #35 -37 (I’ll check the whole thing on Monday)

Objectives IWBAT: Calculate the p. H and p. OH of a solution using p.

Objectives IWBAT: Calculate the p. H and p. OH of a solution using p. H scale calculations Calculate the concentration of an unknown acid by using titration l NOTES: • Titration Lab– 6/2 & 6/3—Tuesday and Wednesday – CLOSED TOE SHOES • Acids & Bases Test – Friday 6/5

Titration Notes/Demo

Titration Notes/Demo

Titration l An acid-base titration is a carefully controlled neutralization reaction: • Acid +

Titration l An acid-base titration is a carefully controlled neutralization reaction: • Acid + Base Salt + Water • ex. HCl (aq) + Na. OH (aq) Na. Cl (aq) + H 2 O(l) l The point of titration is to determine the concentration of an unknown acid or base, using a standard solution that has a known concentration.

Goal of Titration l Procedure used to determine the concentration of an unknown acid

Goal of Titration l Procedure used to determine the concentration of an unknown acid or base l Standard solution – solution with the known concentration

More about Titration l l The equivalence point is when all of the acid

More about Titration l l The equivalence point is when all of the acid and base have neutralized each other. The end point is when the indicator changes color. They should be close together – Why? Some indicators change at high p. H, some at low p. H.

Titration l l l We will be using phenolphthalein as our indicator. What color

Titration l l l We will be using phenolphthalein as our indicator. What color is it? Ms. Bloedorn will demonstrate. http: //img. sparknotes. com/figures/3/3 a 5994498 f 24 d 59 f 5 d 5 d 762 b 40844 a 2 a/titsetup. gif

Equivalence Point l Use phenolphthalein as an indicator • Turns fuchsia in a basic

Equivalence Point l Use phenolphthalein as an indicator • Turns fuchsia in a basic solution • Stop titrating when the solution turns light pink • This is called the endpoint

http: //www. lakelandschools. us/lh/lburris/images/Titration. gif

http: //www. lakelandschools. us/lh/lburris/images/Titration. gif

Titration Calculations l l l Let’s go through Scenario #1 together. Do Scenario #2

Titration Calculations l l l Let’s go through Scenario #1 together. Do Scenario #2 on your own. Let’s review

Titration Practice Problems l l l Work on the Titration Problems Make sure to

Titration Practice Problems l l l Work on the Titration Problems Make sure to show the mole ratio step! I’ll circulate to help—check the answer key as you go

Closure l What is the point of a titration? l What is the difference

Closure l What is the point of a titration? l What is the difference between “end point” and “equivalence point”?

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