Catalyst 1.Draw the coolest picture of equilibrium you possibly can! Show off to your neighbor....
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Transcript of Catalyst 1.Draw the coolest picture of equilibrium you possibly can! Show off to your neighbor....
![Page 1: Catalyst 1.Draw the coolest picture of equilibrium you possibly can! Show off to your neighbor. 2.What is a conjugate acid/base? End.](https://reader035.fdocuments.in/reader035/viewer/2022070414/5697c01b1a28abf838ccf9ff/html5/thumbnails/1.jpg)
Catalyst
1. Draw the coolest picture of equilibrium you possibly can! Show off to your neighbor.
2. What is a conjugate acid/base?
End
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LECTURE 6.6.5 – BUFFERS (CONTINUED)
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• 6.8 – I can identify the conjugate acid and base in a chemical reaction.
• 6.9 – I can explain what a buffer is, draw a titration curve for a buffered solution, and explain why these are essential to maintaining life in humans.
Today’s Learning Target
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A Problem• Wendy Mata is an 10th grade student and she is
very nervous about her upcoming chemistry exam on acids and bases.
• Now Wendy, like many other people, begin to breath rapidly when she gets nervous.
• This is known as hyperventilation.
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A Problem• Wendy begins to breath very rapidly.• The more she thinks of chemistry, the faster she
breaths, which causes her to think even more about chemistry.
• The world around Wendy begins to spin. She becomes very dizzy and passes out.
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A Problem• An ambulance is quickly called.• When she gets to the hospital, the doctors give
her rapid treatment for her condition.• Wendy makes a full recovery and is able to take
her chemistry test.
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Today’s Focus Question
• What caused Wendy to go into shock and how can this be prevented?
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What are buffers?
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I. Buffers• A buffer is a solution that resists
a change in pH.• Weak acids have both an acid
and a salt (that acts as a base) present at all times.– Same applies for weak bases
• Because both acid and base are present, these can react to prevent changes in pH
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Example
CH3COO- + H2O CH3COOH + OH
CH3COO- + H+ CH3COOH
CH3COOH + OH- CH3COO- + H2O
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Weak Acid and Strong Base Titration Curve
Buffering Region
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Blood is a Buffer!• Human blood is buffered to have a pH of 7.3 – 7.5.• Carbonic acid in blood and acts as a buffer:
CO2 + H2O H2CO3 + HCO3-
• Acidosis is when blood becomes to acidic• Alkalosis is when blood becomes to basic
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SUMMARIZE
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You Are the Doctor!• You have the patient that was discussed on the
beginning of class.• With your group
(1) Develop a treatment to cure them if is acidosis
(2) Develop a treatment to cure them if it is alkalosis
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Exit Ticket
1. Label the conjugate acid and base in the following reaction:
HCl + NH3 Cl- + NH4+
2. How do buffers prevent a change in a solutions pH?3. Draw a titration curve of a weak acid titrated with a strong base. Label the equivalence point and the buffering region.
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Learning Log Assessment• Rate yourself 1 – 4 on LTs 6.8 and 6.9
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Work Time• You have the remainder of the class period to
begin working on your formal lab report• The rough draft for this report will be due
Monday-Tuesday February 4th-5th
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Closing Time• Test on Friday• Rough Draft of Lab Report due Tuesday