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Chapter%202%20Practice%20Problems

Chapter%202%20Practice%20Problems - The amino group of...

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9/28/11 Label the titration curve at the points that correspond to the following concentrations: A) high [H3PO4] B) [H3PO4] = [H2PO4-] C) high [H2PO4-] D) [H2PO4-] = [HPO4-2] E) high [HPO4-2] F) [HPO4-2]] = [PO4-3] G) high [PO4-3] Practice Problem
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Acid-Base Buffer Problems 1. Calculate the pH of a buffer consisting of a 0.50 M HF and a 0.45 M NaF solution. Ka of HF = 6.5E-4. 2. Suppose you mix 50.0 mL of 0.40 M NH3 with 50 mL of a 0.40 M HCl. Calculate the [H3O+] and the pH that results from this reaction. 2. The amino acid glycine is often used as the main ingredient of a buffer in biochemical experiments.
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Unformatted text preview: The amino group of glycine, which has a pKa of 9.6, can exist in the protonated form (NH3+) or as the free base (NH2) because of the reversible equilibrium. R-NH3+ a R-NH2 + H+ A) In a 0.1 M solution of glycine at pH 7.0, what is the predominant species in solution. B) In a solution of glycine at pH = 9.0, what is the ratio of glycine (protonated form) to glycine (deprotonated form) at this pH. Practice Problems...
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