When a good indicator has been chosen, the pH at which the solution changes color is very close to the

point of the titration.
Complete the table below:
If this "point" for a particular titration occurs at pH x, a good indicator for for the titration would be ______________.
Note: Provide only 1 indicator name (even if there are other indicators possible) and make sure the spelling is correct.
X indicator
1.5
3.5
6.1
8.9

Here are three sites that will give you a list of indicators and their pH ranges. The first one is a little skimpy on the list BUT the discussion is VERY good.

http://www.chemguide.co.uk/physical/acidbaseeqia/indicators.html

http://en.wikipedia.org/wiki/Titration

http://www.ausetute.com.au/indicata.html

To determine a good indicator for a titration at a specific pH, you need to know the pH range over which the indicator changes color. This range should include the pH at which the titration "point" occurs to ensure accurate endpoint detection.

To find the proper indicator, you can refer to an indicator chart or an indicator color change guide. One widely used indicator chart is the "pH indicator color chart" developed by the Royal Society of Chemistry (RSC).

Let's refer to the chart to determine the indicator for each pH value in the table:

1.5: The closest indicator in the chart that changes color within a pH range near 1.5 is phenolphthalein.
3.5: Since this is slightly higher than the previous pH, the indicator used could still be phenolphthalein, which has a range around pH 8.2-10.0 for color change.
6.1: The closest range in the chart is bromothymol blue, which changes color around pH 6.0-7.6.
8.9: The indicator required should change color at a slightly higher pH than the previous one. Bromothymol blue may still be appropriate as it has a range around pH 6.0-7.6.

Therefore, filling in the table:

X | indicator
--------------
1.5 | phenolphthalein
3.5 | phenolphthalein
6.1 | bromothymol blue
8.9 | bromothymol blue