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2. Phenolphthalein - Wikipedia

   en.wikipedia.org/wiki/Phenolphthalein

   Phenolphthalein (/ f ɛ ˈ n ɒ l (f) θ ə l iː n / [citation needed] feh-NOL(F)-thə-leen) is a chemical compound with the formula C 20 H 14 O 4 and is often written as "HIn", "HPh", "phph" or simply "Ph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations.

3. Neutralization (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Neutralization_(chemistry)

   In a titration of a weak acid with a strong base the pH rises more steeply as the end-point is approached. At the end-point, the slope of the curve of pH with respect to amount of titrant is a maximum. Since the end-point occurs at pH greater than 7, the most suitable indicator to use is one, like phenolphthalein, that changes color at high pH. [2]

4. Acid–base titration - Wikipedia

   en.wikipedia.org/wiki/Acid–base_titration

   Three different points in an acid-base titration using phenolphthalein as the indicator Phenolphthalein is widely recognized as one of the most commonly used acid-base indicators in chemistry. [ 12 ] Its popularity is because of its effectiveness in a broad pH range and its distinct colour transitions. [ 12 ]

5. Total acid number - Wikipedia

   en.wikipedia.org/wiki/Total_Acid_Number

   The meter reading (in millivolts) is plotted against the volume of titrant. The end point is taken at the distinct inflection of the resulting titration curve corresponding to the basic buffer solution. Color indicating titration: An appropriate pH color indicator e.g. phenolphthalein, is used. Titrant is added to the sample by means of a burette.

6. Titration - Wikipedia

   en.wikipedia.org/wiki/Titration

   Phenolphthalein, a commonly used indicator in acid and base titration. The approximate pH during titration can be approximated by three kinds of calculations. Before beginning of titration, the concentration of [ H + ] {\displaystyle {\ce {[H+]}}} is calculated in an aqueous solution of weak acid before adding any base.

7. Acid value - Wikipedia

   en.wikipedia.org/wiki/Acid_value

   The acid number for an oil sample is indicative of the age of the oil and can be used to determine when the oil must be changed. [5] A liquid fat sample combined with neutralized 95% ethanol is titrated with standardized sodium hydroxide of 0.1 eq/L normality to a phenolphthalein endpoint. The volume and normality of the sodium hydroxide are ...

8. AOL

   search.aol.com

   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

9. pH indicator - Wikipedia

   en.wikipedia.org/wiki/PH_indicator

   Moreover, pH indicators form one of the three main types of indicator compounds used in chemical analysis. For the quantitative analysis of metal cations, the use of complexometric indicators is preferred, [ 2 ] [ 3 ] whereas the third compound class, the redox indicators , are used in redox titrations ( titrations involving one or more redox ...