BioChem 3: Acids and Bases
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Questions and Answers

Which of the following is an example of a strong acid?

  • CH3COOH
  • NaOH
  • HCl (correct)
  • H2CO3

Which of the following equations represents the ionization of HCl in water?

  • HCl + H2O -> H3O+ + Cl-
  • HCl -> H+ + Cl- (correct)
  • HCl + H+ + Cl-
  • HCl + OH- -> H2O + Cl-

What is the pH of a solution with a concentration of HCl of 0.01M?

  • 3
  • 4
  • 1
  • 2 (correct)

What is the pH of a solution with a concentration of HCl of 0.001M?

<p>3 (A)</p> Signup and view all the answers

Which of the following is an example of a strong base?

<p>NaOH (B)</p> Signup and view all the answers

Which of the following equations represents the ionization of NaOH in water?

<p>NaOH + H2O -&gt; Na+ + OH- (A)</p> Signup and view all the answers

What is the pH of a solution with a concentration of NaOH of 0.01M?

<p>14 (B)</p> Signup and view all the answers

What does the "p" in pH mean?

<p>it indicates the negative logarithm of the hydrogen ion concentration (A)</p> Signup and view all the answers

What is the Henderson-Hasselbalch equation used to describe?

<p>The ionization of weak acids (A)</p> Signup and view all the answers

Substance X is 50% deprotonated at a pH of 8.5 and almost 100% deprotonated at a pH of 9.5. Which of the following best describes X?

<p>weak base (D)</p> Signup and view all the answers

Which property of water is responsible for its high boiling point?

<p>High heat of vaporization (D)</p> Signup and view all the answers

What is the pH of a solution with a hydroxide ion concentration of $10^{-5}$ M?

<p>9 (C)</p> Signup and view all the answers

A reaction has a positive ΔH. Which of the following statements is true about this reaction?

<p>This is an endothermic reaction (A)</p> Signup and view all the answers

What is the pH of a neutral solution?

<p>7 (B)</p> Signup and view all the answers

Which molecule is transported back into the red blood cell in the lungs?

<p>HCO3- (C)</p> Signup and view all the answers

What is the role of carbonic anhydrase in the lungs?

<p>It converts H2CO3 to CO2 (C)</p> Signup and view all the answers

What is the pH range for cell survival?

<p>6-8 (B)</p> Signup and view all the answers

Why does blood pH increase with hyperventilation?

<p>Hyperventilation causes a decrease in HCO3- concentration (D)</p> Signup and view all the answers

What type of bond is stronger: a hydrogen bond or a covalent bond?

<p>Covalent bond (A)</p> Signup and view all the answers

What is the solute in a solution of water and salt?

<p>Salt (D)</p> Signup and view all the answers

What protects the body against acidity from normal metabolism?

<p>Buffers, expiration of CO2 through the lungs, and excretion of NH4+ through the kidneys (C)</p> Signup and view all the answers

What is the formula for calculating pH?

<p>pH = -log[H+] (A)</p> Signup and view all the answers

What is the range of acid production from normal metabolism in the body?

<p>13 to 22 mol/day (D)</p> Signup and view all the answers

Which molecule is exported in the plasma via the HCO3-/Cl- transporter?

<p>H2CO3 (A)</p> Signup and view all the answers

How many hydrogen bonds can each water molecule form?

<p>4 (C)</p> Signup and view all the answers

What is the main solvent in biosystems?

<p>Water (B)</p> Signup and view all the answers

What happens to H2CO3 in the lungs?

<p>It is converted to water and CO2 (D)</p> Signup and view all the answers

Why do cells die when the pH falls below 6.8?

<p>Low pH denatures enzymes (A)</p> Signup and view all the answers

What is the main role of carbonic anhydrase in the body?

<p>the reversible reaction of H2CO3 to CO2 (B)</p> Signup and view all the answers

What is the function of the HCO3-/Cl- transporter?

<p>To export HCO3 from the the body and balance intracellular pH (B)</p> Signup and view all the answers

Match the buffering system with where it works best:

<p>Bicarbonate = An important extracellular buffer, with minimal intracellular buffering ability Phosphate = An important intracellular buffer, with minimal blood buffering ability Protein = An important intracellular buffer, with some blood buffering ability Bicarbonate = HCO3 -&gt; H2CO3 -&gt; carbonic anhydrase -&gt; CO2 _ H2O</p> Signup and view all the answers

Choose the TRUE statements regarding the Henderson-Hassel Bach equation (more than one may apply):

<p>B and C are correct (D)</p> Signup and view all the answers

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