Question

name the alternative staining reagent for phenolphthalein for the test for acidity​

Answer 1

An alternative staining reagent for phenolphthalein is copper sulphate.

• Phenolphthalein is a visual indicator used in acid-base titrations.
• It turns from bright pink to colourless when the titrimetric solution changes from basic to acidic, respectively.
• This helps in visually estimating the end point of the reaction.
• CuSO₄.5H₂O is blue in colour and behaves like phenolphthalein in acid-base titrimetry.

Answer 2

Litmus paper, methyl orange are the staining reagent for phenolphthalein for the test for acidity.

Explanation:  

• There are large number of alternate stain for deciding whether substance is acidic or basic. The most popular stains for determining the acidity is the Litmus Paper and methyl orange indicator.  

• Methyl orange indicator gives a characteristic red colour when introduced in an acidic solution. Similarly it gives a yellow colour in basic medium.  

• Litmus Paper when introduced in acidic solution changes colour from Blue to red and in basic medium it changes its colour from red to blue.

Learn more about phenolphthalein

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