PASS Biochemistry Quiz Buster One

True or false: at the half-equivalence point of a titration curve, pH = Ka.

• True

• False

What type of weak interaction is described as an electrostatic bond between a partially positive hydrogen atom in one molecule and an electronegative atom in another molecule? 

• Ionic interactions

• Hydrophobic interactions

• Hydrogen bonding

• van der Waals interactions

In which state does water form the maximum number of hydrogen bonds?

• Ice

• Liquid

• Gas

• All answers apply

What would occur if oil was mixed with water? 

• Oil would become uniformly distributed throughout the water as they are both polar 

• The oil would aggregate together to reduce the surface area in contact with the water molecules 

• Oil would become uniformly distributed throughout the water as they are both nonpolar 

• None of the answers apply

How many times more acidic is a solution of pH 2 compared to a solution of pH 6? 

• 3 times

• 4 times

• 1000 times

• 10,000 times

Which weak acids would be the most effective buffer at pH 5? 

• Propionic acid (pKa = 4.87) 

• Lactic acid (pKa = 3.86) 

• Benzoic acid (pKa = 4.19) 

• Iodic acid (pKa = 0.80) 

The [H+] concentration in milk is 1.6 x 10-7 M, what is the pH?

• 1.60

• 6.80

• 7.00

• 6.50

A buffer solution comprises which of the following?

• A weak acid in solution 

• A strong acid in solution 

• A weak base in solution 

• A weak acid and its conjugate base in solution 

Calculate the pH when 0.8 mole of NaOH is added to 1 mole of formic acid (pKa = 3.75). 

• 4.35

• 3.15

• 3.63

• 3.87

Calculate the pH value obtained when 1 mL of 0.01 M NaOH is added to 999 mL of pure water

• 5

• 9

• 10

• 12