Credit: RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA/SCIENCE PHOTO LIBRARY

Caption: Acid-base titration. Timelapse footage of the stages in an acid-base titration analysis. The clip starts with 250 millilitres of an acid in a volumetric flask being poured into a beaker. A graduated pipette is used to withdraw a precise volume (20 millilitres) for use in the titration. The clip then shows a burette being filled with 50 millilitres of an alkaline solution via a glass funnel. The view changes to show a conical flask (containing the 20 millilitres of acid previously measured out) with the burette positioned above it. The demonstrator is adding phenolphthalein indicator to the acid. This indicator is colourless in acid solutions, turning pink in basic (alkaline) solutions. The burette tap is opened and the alkali added with the flask swirled to mix the chemicals. The endpoint of the reaction occurs when the solution goes permanently pink. The end of the clip shows this endpoint reached by dropwise addition of the alkali. The precise volumes and concentrations used in such titrations allow calculation of an unknown concentration. The reagents used here are sodium hydroxide (NaOH) and hydrochloric acid (HCl).

Release details: Model release not required. Property release not required.

Keywords: acid, acid-base, acid-base indicator, alkali, alkaline, analysis, analytical, base, beaker, burette, calculation, chemical, chemist, chemistry, clip, color, colorless, colors, colour change, colourless, colours, concentration, demonstration, demonstrator, dropwise addition, education, educational, endpoint, experiment, film, footage, glass funnel, graduated pipette, hcl, human, hydrochloric acid, lab, laboratory, mixture, motion, naoh, one person, people, person, ph, ph indicator, phenolphthalein, pink, purple, reaction, school science, scientist, sodium hydroxide, sped up, speeded up, studio shot, time-lapse, timelapse, video, volumetric analysis, volumetric flask

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Acid-base titration

K004/5215 Rights Managed

Downloadable master

Duration: 00:01:44.09

Frame size: 1920x1080

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 1.4G

Original

Capture format: Sony FS700

Codec: Apple ProRes 422 HQ

Interlaced: Yes

Please contact Science Photo Library if you require the original, or other formats.

 

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