what are acid and base indicators? Their type and colour change acidic and basic medium
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Answer:
An acid-base indicator is either a weak acid or weak base that exhibits a color change as the concentration of hydrogen (H+) or hydroxide (OH-) ions changes in an aqueous solution. Acid-base indicators are most often used in a titration to identify the endpoint of an acid-base reaction.
Answer:
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Explanation:
Acid-Base Indicator Definition
An acid-base indicator is either a weak acid or weak base that exhibits a color change as the concentration of hydrogen (H+) or hydroxide (OH-) ions changes in an aqueous solution. Acid-base indicators are most often used in a titration to identify the endpoint of an acid-base reaction. They are also used to gauge pH values and for interesting color-change science demonstrations.
Table of Common pH Indicators
Several plants and household chemicals can be used as pH indicators, but in a lab setting, these are the most common chemicals used as indicators:
Indicator Acid Color Base Color pH Range pKIn
thymol blue (first change) red yellow 1.2 - 2.8 1.5
methyl orange red yellow 3.2 - 4.4 3.7
bromocresol green yellow blue 3.8 - 5.4 4.7
methyl red yellow red 4.8 - 6.0 5.1
bromothymol blue yellow blue 6.0 - 7.6 7.0
phenol red yellow red 6.8- 8.4 7.9
thymol blue (second change) yellow blue 8.0 - 9.6 8.9
phenolphthalein colorless magenta 8.2 -10.0 9.4
The "acid" and "base" colors are relative. Also, note some popular indicators display more than one color change as the weak acid or weak base dissociates more than once.
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