Chemical Formulas & the Ratio Indication in General Chemistry Worksheet

Questions: 2. You have a solution of 1 M acetic acid. The chemical formula of acetic acid is CH3COOH. When the proton dissociates from acetic acid, you are left with CH3COO-. The pKa of acetic acid is 4.75.(A) Please show your math to indicate the ratio of CH3COO- to CH3COOH at a pH of 3.75. (2 pts)(B) Please show your math to indicate the ratio of CH3COO- to CH3COOH at a pH of 4.75. (2 pts)(C) Please show your math to indicate the ratio of CH3COO- to CH3COOH at a pH of 6.75. (2 pts)(D) At which pH would acetic acid have its most optimal buffering capability? (2 pts)3. Carnosine is a dipeptide found in the cytoplasm of muscle cells. It is also known as β-Alanyl-L-histidine. It has a pKa of 6.83. At rest, muscle pH = 7.1. After strenuous exercise, muscle pH can reach as low as 6.4 from glycolysis, the generation of lactate and H+ ion.(A) Using Henderson-Hasselbalch and showing your math, please determine the percentage of protonated carnosine (relative to total carnosine) in muscle at rest. (4 pts) (B) Using Henderson-Hasselbalch and showing your math, please determine the percentage of protonated carnosine (relative to total carnosine) in muscle after strenuous exercise. (4 pts)(C) After finding your answers in parts 3A and 3B, in 50 words or less, what do you think is the role of carnosine in muscle cells? When answering, please consider the role of weak acids in biology. (3 pts)4. When describing a blood buffering scenario, the terms “metabolic” and “respiratory” are used to describe an acidosis or alkalosis. In 100 words or less, how does one distinguish between when to use either term (“metabolic” or “respiratory”) when describing the blood buffering scenario being described? (5 pts)5. Consider the following tri-peptide: Phe-Ala-Glu . Please describe the tripeptide in a paragraph that identifies its N-terminal amino acid, C-terminal amino acid, which is/are essential amino acid(s), the general characterization of the amino side chains (R groups), and the pI of the tripeptide. (6 pts)

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