Acid-base titration. In this sequence the Erlenmeyer flask initially contains 50 mL of sulfuric acid (H2SO4) solution of unknown concentration (0.04M was used here). Burette above it contains 0.1M solution of sodium hydroxide (NaOH), frame 1. First, a couple of drops of phenolphthalein are added to Erlenmeyer flask. Sodium hydroxide is then added gradually and the flask is swirled to mix the content. When the last drop is added, the solution retains pale pink colour, frame 2. At this point (equivalence point) the volume of the base used is recorded and the initial concentration of the acidic solution is calculated. When sodium hydroxide is added in access beyond the equivalence point, the solution turns bright pink, frame 3, indicating basic solution. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Science Source / Turtle Rock Scientific |
Bildgröße: | 7000 px × 3738 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |