Wolfram|Alpha

Computing...

Input interpretation:

indicators | changing color at pH 3


Results:

indicator | pH range\nquinaldine red | 1.4 to 3.2 (colorless to red)\n2,4-dinitrophenol | 2.0 to 4.7 (colorless to yellow)\nbenzopurpurin 4B | 2.2 to 4.2 (violet to red)\nmethyl yellow | 2.8 to 4.4 (red to yellow)\nbromophenol blue | 3.0 to 4.6 (yellow to blue)