15b Flashcards
when will a cation not affect the pH?
when it’s part of a strong base
KaKb=
Kw
KaKb=…
1x10^-14
the lower the pKa
the stronger the acid
pH buffer
solution of a weak acid and its conjugate base
why is pH buffer good?
resistant to pH changes
buffer range
pH range within which a given buffer can provide pH protection
what is the buffer range?
pKa+-1
to make a buffer
- pick an acid who pKa is the pH you want +-1
2. determine the base to acid ratio you need to get the target pH
buffer capacity
quantity of acid/base that a buffer can neutralize while maintaining pH pithing desired range
pH indicators
water-soluble, weak organic acids, that change color as the pH changes
buffer is usually a solution of…
a weak acid and its conjugate base
what does a decrease in H+ ions mean
a raise in the pH and a shift to the left
when can you apply the common-ion affect
any equilibrium involving a weak acid and its conjugate base
