BIOC 2 Flashcards
(17 cards)
What unqique properties of water are hydrogen bonds responsible for?
Cohesiveness/Adhesiveness(suface tension), High heat capacity, high heat of vaporization, expansion upon freezing, versatility as a solvent.
What is the Bronsted Acid/Base Theory?
Bronsted acid is a proton donor, Bronsted base is a proton acceptor
What acids fully dissociate in water?
Strong Acids, such as HCl and H2SO4
What acids partially dissolve in water? What is the dissociation constant equation?
Weak acids only partially dissolve in water. Kd = [Conjugate Base][Conjugate Acid]/[Acid]
What is the pH of a 0.1 M solution of acetic acid? Ka = 1.7 * 10e-5
pH = 2.88
What is the logarithm of 2 without using a calculator?
0.3
What is the logarithm of 2^n without using a calculator?
0.3n
If the pH change is 0.3, what is the factor that [H+] changes?
2
What is the Henderson-Hasselbalch equation?
pH = pKa+log([A-]/[HA])
What is the pH of a solution in which the concentration of acetate = the concentration of acetic acid? Acetic Acid pKa = 4.76
4.76
What is the resulting pH when acetic acid is added so that the concentration of acetic acid doubles?
4.46
What is the pH of acetic acid when [A-] = 4[HA]? pKa = 4.76
5.36
What is the pH of acetic acid when [HA] = 2[A-]? pKa = 4.76
4.46
If the pH of acetic acid is 4.06, what is the ratio of [A-]/[HA]? pKa = 4.76
0.2
When equal volumes of a solution of 0.1 M acetic acid(pH = 2.88) and a solution of 0.1M acetic acid and 0.1M acetate (pH =4.76). What is the pH?
What is a buffer?
An aqueous mixture of a weak acid and its conjugate base. When acid or base is added, it has little effect on pH, buffers are effective within 1 pH from pK.
