chapter 14 Flashcards
1
Q
what is the acid type indicator chemical equation?
A
HIn + H2O -> In- + H3O+
2
Q
what is the base type indicator chemical equation?
A
In + H2O -> InH+ +OH-
3
Q
how can we find H3O+ conc. by the acid indicator equation?
A
[H3O+] = Ka [HIn]/[In]
4
Q
how can we find OH- conc. by the base indicator equation?
A
[OH-] = Kb [In]/[InH+]
5
Q
when does averge indicator exhibit pure acid and base color?
A
acid: when [HIn]/[In-] is greater than 10
base: when [HIn]/[In-] is less than 0.1
6
Q
what is the pH eq of acid and base color and its range?
A
acid: pH = pKa +1
base: pH = pka -1
range: pka +- 1
