Unit 1-pH

Question 1

pH

Answer 1

hydrogen ion concentration

formula: -log [H+]

pH of 7 is only neutral with pure water @ 25 degrees celcius

Question 2

Autoionization

Answer 2

transfer of a proton from one water molecule to another

if temp increases, autoionizatoin increases

Question 3

Acidic Solution

Answer 3

donation of protons

higher concentration of H+ ions than OH (hydroxyls)

pH is less than 7

Question 4

Basic Solution

Answer 4

accepts protons

higher concentration of OH than H+ ions

pH is greater than 7

Question 5

Neutral Solution

Answer 5

equal concentration of H+ and OH-

Question 6

Buffers

Answer 6

weak acids or bases that react with strong acids or bases to prevent changes in pH

pKa in buffers prevents a solution from becomes to acidic or too basic

buffers keep pH the same

Bicarbonate is the most important buffer because it allows pH to shift a little (pKa=6.4)

Question 7

pKa

Answer 7

pH when it is half ionized and half is not