Question

9. You are provided Lemon juice, Lime water, Milk of Magnesia, curd, Toothpaste. Compare the
colour changes that would take place in litmus solution: turmeric and phenolphthalein indicators.​

Answer 1

First, let's categorize all the substances as acids and bases:

Acids:

Lemon juice

Lime water

Curd

Bases:

Milk of Magnesia

Toothpaste

Litmus Paper

Acids turn blue litmus to red, and bases turn red litmus to blue.

Lemon juice, lime water and curd will turn blue litmus to red. Milk of Magnesia and toothpaste will turn red litmus to blue.

Turmeric Solution

Acids don't change the color of turmeric solution, and bases turn the color of turmeric solution to reddish brown.

Lemon juice, lime water and curd will not change the color of turmeric solution. Milk of Magnesia and toothpaste will change the color of turmeric solution to reddish brown.

Phenophthalein

Acids don't change the color of phenophthalein, but bases change the color of phenophthalein to magenta.

Lemon juice, lime water and curd will not change the color of phenophthalein. Milk of Magnesia and toothpaste will change the color of phenophthalein to magenta.

Answer 2

Answer:

i. Lemon juice will turn litmus red ,turmeric yellow , phenolphthalein colourless.

ii.lime water will turn same as the lemon juice

iii. Milk of magnesia will turn litmus blue , turmeric reddish brown and phenolphthalein pink in colour.

iv. curd as i.

v. toothpaste as iii.