What colour does phenolphthalein turn to in a basic solution?
Pink
Phenolphthalein is an acid–base indicator. It is colourless in acidic and neutral solutions but turns pink in a basic (alkaline) solution, because the change in pH alters the structure of the indicator molecule and hence the light it absorbs. This makes it a common indicator for detecting bases and for titrations.
"Colourless" is the colour phenolphthalein shows in acidic or neutral solutions, not basic ones. "Yellow" and "red" are colours associated with other indicators (for example, methyl orange is yellow in base and red in strong acid), but they are not the colour of phenolphthalein in a base.
Hence, phenolphthalein turns pink in a basic solution.
Similar Questions
Impurities are converted to compounds by adding refining agents in which type of refining method?
Metals of medium reactivity are generally found in the form of which compounds?
Which of the following is the purest form of iron?
Which of the following is the carbon allotrope having a tetrahedral structure?
A student is comparing samples of sulphur, carbon (Diamond), and bromine. Which property is least likely to be observed in all three?
Which of the following correctly explains why an acid shows acidic behaviour only in aqueous solution?
The study of metals and their properties belongs to which branch of chemistry?
In which combined form is oxygen found in the air besides free O2?
Which statement best describes the electrical conductivity of non-metals in their pure form?
Which material would be the best choice for electrical transmission lines?
Important Questions from Chemistry
What is deposited on iron in the process of Galvanization?
Which element is used for making solar cells?
Which gas is flushed in a bag of chips to prevent the chips from getting oxidized?
Terylene is a type of:
Who was the first Indian lady scientist who worked with organic chemistry and medicinal plant?
