C/P

Question 1

what do hydrogen bonds require?

Answer 1

• hydrogen bond donor: molecule with a H bonded to a highly electroneg. atom such as oxygen or nitrogen
• hydrogen bond acceptor: electronegative atom (N, O, F) with an available lone pair of electrons

Question 2

how to find pH from molarity

Answer 2

pH = -log(H+)

pH = the negative log of the concentration of H+ ions

• ex: if 0.01 M HCl, what is the pH?

Question 3

find the pH of a solution of a 2.3x10^-4 molar solution of NaOH

Answer 3

gameplan: (OH-) –> pOH –> pH

Question 4

how to handle logs on the MCAT?

Answer 4

• log (#) –> log base 10
• so 10 to what power = # ???
• –
• negative logs
  
  • • log (0.1) = 1 because 1 x 10^-1 = 0.1
  • • log of 1x10^-4 = 4, - log of 1x10^-11 = 11 etc.
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