CBSE Class 10 Science 2017 · Paper 531/1 · Question 35
What do you observe when you pour a few drops of acetic acid to a test tube containing
(A) Distilled water ?
(B) Red litmus solution ?
(C) Blue litmus solution ?
(D) Universal indicator ?
Answer
It dissolves in water, leaves red litmus unchanged, turns blue litmus red and turns universal indicator orange.
(A) The acid dissolves completely: a clear, colourless solution forms, with no separate layer.
(B) No change: the red litmus solution stays red.
(C) The blue litmus solution turns red, showing that acetic acid is an acid.
(D) The universal indicator turns orange (pH about 3 to 4), showing an acidic solution; it is not the deep red of a strong acid, because acetic acid is a weak acid.
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