Ch 14 Titrations

Equivalence

moles acid = moles base

Acid-base titrations

neutralization reactions

For acid/base titrations, assume ____ completion

100%

Acid/base equation

acid + base → salt + water

Acid/base titration curve

S-shaped curve

pH ___ @ equivalence

changes dramatically

Titration solution can be

acidic, basic, or neutral

Strong base + strong acid pH

~ 7.00

Weak acid + strong base pH

> 7.00

Weak base + strong acid pH

< 7.00

At equivalence, all HA / B has been ___

converted to its conjugate

Halfway to equivalence, pH =

pK_A

Acid-base indicator

a weak organic acid/base whose color differs from that of its conjugate

Indicator end point

indicator changes color

Choose indicator so that ___ and ___ coincide

end point, equivalence point

Color changes when ___ in +2 pH units

pH ~ pK_A

Choose indicator so color change is ___

close to pH at equiv.