Acid-base titration. Image 3 of 3. Titrations are a method of volumetric analysis, in which a volume of one reagent is added to a known volume of anot

---

Acid-base titration. Image 3 of 3. Titrations are a method of volumetric analysis, in which a volume of one reagent is added to a known volume of another reagent until an end point. This end point can be measured by using an indicator, a substance that changes colour depending on its environment. This reaction is an acid-base titration, and the indicator used is methyl orange. The solution in the conical flask (bottom) has gone beyond the end point of pH , due to the addition of excess alkali from the burette (upper centre). The indicator is yellow here, showing it is more alkali. For a sequence showing the change in colour at the end point, see images A500/348-350.

---

Size: 3887px × 5680px
Photo credit: © MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: acid, acid-base, acidic, alkali, alkaline, base, basic, burette, chemical, chemicals, chemistry, conical, experiment, flask, indicator, methyl, orange, ph, reaction, reagent, reagents, scale, school, solution, solutions, titrant, titration