The titration shown here has an equivalence point at pH = 4.3. Using this table,

Question

The titration shown here has an equivalence point at pH = 4.3. Using this table, identify which of the following indicators would be appropriate for this titration. Check all that apply.

Sapling Learning this question has been customized by Ed Lee at Texas A&M; University Map The titration shown here has an equivalence point at pH 4.3. Using this table, identify which of the following indicators would be appropriate for this titration. Check all that apply. Titration Data metacresol purple bromothymol blue ethyl orange bromocresol purple phenolphthalein pH 5.3 quinaldine red end-point pH range 3.3 Titrant volume

Explanation / Answer

we need a titrant which changes colorb etween the range:

5.3 to 3.3

then..

metacresol purple will not do --> 1.2 ? 2.8

bromothymo blue will not do --> 6.0 ? 7.6

ehtyl orange = 3.4-4.8; will do, choose this as an option

bromocresol purple --> will not do 5.2-6.8

phenolphthalein will not do -- >8.2-10.0

quinaldine red --> 1.4-3.2 could be, but will be slightly OFF, titration needs to be exact

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