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indicators

fireange1-disab
1-Newbie

indicators

can someone please explain to me how you determine which indicator to use for certain solutions? in a recent experiment, we titrated NaOH with ethanoic acid. Our teacher tried to explain to us the end solution was basic using some equations, eg,:
NaOH + CH3COOH � NaCH3COO + H2O
Na+ + CH3COOH � Na(+) + CH3COO(-)
CH3COO - + H2O � CH3COOH + OH(-)
CH3COO - + H3O(+) � CH3COOH + H2O

And she said since the solution is slightly basic, we should use the indicator phenophalein. How did she come to this conclusion?
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