Topic 12 Acids and bases

Cards (17)

What is a bronstead lowery acid? [1]
Proton donor
What is a bronstead lowery base? [1]
Proton acceptor
How much do strong acids dissociate in water? [1]
Strong acids dissociate almost completely in water
How much do strong bases ionise in water? [1]
Strong bases ionise almost completely in water
How much do weak acids dissociate in water? [1] 
Weak acids slightly dissociate in water
How much do weak bases ionise in water? [1]
Only slightly
What is the equation for kw? [1]
kw= [H+] [OH-]
How does the kw equation change when dealing with pure water? [1]
kw= [H+]^2
What are the two ph equations? [2]
pH=-log10[H+]. [H+]= 10^-pH
What ka equation would form from this equation HA<=> H+ +A-
ka= [H+] [A-]/ [HA]
What is an acid buffer made from? [1]
Weak acid and one of its salts
What pH does an acidic buffer tend to have? [1]
less than 7
What is a basic buffer made from? [1]
Weak base and one of its salts
What pH do basic buffers tend to have? [1] 
More than 7
Most shampoos contain a ph buffer 5.5 Human hair becomes rough if exposed to alkaline conditions
Biological washing powders also contain buffers. They keep the ph at the right level for enzymes to work most efficiently
There are graphs needed to know so look at notes