What is an acid

What is an acid - Several acid-base indicators are listed...

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What is an acid-base indicator?   An acid-base indicator is a weak acid or a weak base. The undissociated form of  the indicator is a different color than the iogenic form of the indicator. An Indicator  does not change color from pure acid to pure alkaline at specific hydrogen ion  concentration, but rather, color change occurs over a range of hydrogen ion  concentrations. This range is termed the  color change interval . It is expressed as  a pH range. How is an indicator used?  Weak acids are titrated in the presence of indicators  which change under slightly alkaline conditions. Weak bases should be titrated in  the presence of indicators which change under slightly acidic conditions. What are some common acid-base indicators?
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Unformatted text preview: Several acid-base indicators are listed below, some more than once if they can be used over multiple pH ranges. Quantity of indicator in aqueous (aq.) or alcohol (alc.) solution is specified. Tried-and-true indicators include: thymol blue, tropeolin OO, methyl yellow, methyl orange, bromphenol blue, bromcresol green, methyl red, bromthymol blue, phenol red, neutral red, phenolphthalein, thymolphthalein, alizarin yellow, tropeolin O, nitramine, and trinitrobenzoic acid. Data in this table are for sodium salts of thymol blue, bromphenol blue, tetrabromphenol blue, bromcresol green, methyl red, bromthymol blue, phenol red, and cresol red....
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What is an acid - Several acid-base indicators are listed...

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