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Equivalence point


The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of acid and base have been mixed. In other words, the moles of acid are ...

acid-base indicators - Chemguide


Describes how indicators work, and their use in various acid-base titrations. ... At some point during the movement of the position of equilibrium, the ... the reason for the colour changes in methyl orange and phenolphthalein, they are ...

Acid base titration end point detection


Apr 6, 2012 ... However, color change is not instant (see acid-base indicators). ... titration curve of strong acid titrated with strong base against phenolphthalein.

6. Acid-Base Indicators - Chemwiki


Aug 21, 2015 ... You should be able to work out for yourself why the color changes when you add ... Phenolphthalein is another commonly used indicator for titrations, and is ... At this point the concentrations of the acid and its ion are equal.

Why do we use phenolphthalein as an indicator in titration? - Quora


Nov 25, 2015 ... Well, you may have used phenolphthalein as the indicator in a particular ... is necessary for color change that indicates the equivalence point.



Indicators are substances whose solutions change color due to changes in pH. ... Phenolphthalein, Colorless, 8.2 - 10.0, Pink ... in the table above has a pKai value of 9.7, which is the closest to the pH of equivalence point in this titration.

IB Chemistry higher level notes: Indicators - IBChem.com


In the case of ethanoic acid there will be no colour change so it could not be used ... If we use phenolphthalein as an example then the molecular form of ... However, with the titration of a strong acid and a weak base the equivalence point will ...

Acid Base Indicators


Phenolphthalein is one of the most common indicators used for beginning ... There are many other indicators that change colors at different pH's, and so are useful ... indicator so that its pH range will match the equivalence point of the titration.

General Chemistry Online: FAQ: Acids and bases: How can strong ...


has a very large jump in pH at the equivalence point * ... The rather gaudy diagram above shows the titration curve for a strong acid (40 mL of ... The colored bands show the pH ranges at which indicator color changes occur. ... But the color changes for methyl orange , bromothymol blue, and phenolphthalein will all occur at ...

Chemistry Tutorial : Indicators - AUS-e-TUTE


The equivalence point <sup>1</sup> of an acid-base reaction is when the amount of acid and of ... An appropriate indicator for an acid-base titration will change colour at the .... Consider thymol blue (pH range 8.0 - 9.6) or phenolphthalein (8.3 - 10.0) as ...

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Titration - end point detection


Apr 10, 2012 ... basic information about end point detection in titration. ... Methyl red changes its color between pH 4.4 and 6.2. .... it doesn't matter much whether we titrate till we start to see phenolphthalein, or till the color change is complete ...



Acid - Base Indicators and Titrations. Acid - Base indicators (also known as pH indicators) are substances which change colour with pH. ... The acid and its conjugate base have different colours. ... Phenolphthalein is an example of an indicator which establishes this type of equilibrium in aqueous solution: ... At this point: ...

Titrations, Indicators and Titration Curves


This is called the end point of the titration (or equivalence point of the reaction). ... In reactions where there is a colour change an indicator may not be needed, as in ... Two familiar acid-base indicators are methyl orange and phenolphthalein.