Phenolphthalein: The colour change observed when the

The colour change observed when the solution of magnesium hydroxide is tested with the following indicators is phenolphthalein turns colourless to pink. What is phenolphthalein ? In an acid-base titration, phenolphthalein is employed as an indicator. It turns pink in alkaline solutions and is colourless in acid solutions as an indicator. How to make phenolphthalein indicator - 60590502Explanation: A simple way to make phenolphthalein indicator is to mix 1 gram of phenolphthalein powder with 100 milliliters of 95% ethanol (or another suitable solvent) in a clean and dry container. Once the powder has dissolved, dilute the mixture with distilled water at a ratio of 1:9 ( phenolphthalein solution to water) to obtain the indicator. Note that phenolphthalein is a strong irritant and should be handled with care using appropriate ... Phenolphthalein is colorless in acidic solutions. If you add a few drops of sodium hydroxide (NaOH) solution to the above mixture, the pink color will reappear. This is because the added sodium hydroxide makes the solution alkaline again, and phenolphthalein turns pink in alkaline solutions. Phenolphthalein solution turns pink in basic solution and remains colourless in acidic solution. So , A turns it pink, which means A is a basic solution.When B is added, colour disappeared, that is, B is acidic.