u11ohnotes18f2005(7)

u11ohnotes18f2005(7) - Buffers chemicals that resist...

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Buffers Æ chemicals that resist changes in pH Example: The pH of blood is 7.4. Many buffers are present to keep pH stable. H 1+ + HCO 3 1– ÅÆ H 2 CO 3 ÅÆ H 2 O + CO 2 hyperventilating : CO 2 leaves blood too quickly [ C O 2 ] s h i f t r i g h t [ H 1+ ] pH (more basic) a l k a l o s i s : blood pH is too high (too basic) Remedy: Breathe into bag. [ C O 2 ] shift left [ H 1+ ] pH (more acidic, closer to normal) acidosis : blood pH is too low (too acidic)
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More on buffers: -- a combination of a weak acid and a salt -- together, these substances resist changes in pH (A) weak acid: CH 3 COOH CH 3 COO 1– + H 1+ (lots) (little) (little) (B) salt: NaCH 3 COO Na 1+ + CH 3 COO 1– ( l i t t l e ) ( l o t s ) ( l o t s ) If you add acid… (e.g., HCl Æ H 1+ + Cl 1– ) 1. large amt. of CH 3 COO 1– consumes extra H 1+ as in (A) going 2. **Conclusion: pH remains relatively unchanged. If you add base… (e.g., KOH Æ K 1+ + OH 1– ) 1. extra OH 1– grabs H 1+ from the large amt. of available
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This note was uploaded on 01/23/2012 for the course CHEM 11 taught by Professor Staff during the Fall '08 term at Concordia AB.

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u11ohnotes18f2005(7) - Buffers chemicals that resist...

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