Question

A student dips pH papers in solution X and Y and observes that the pH paper
turns blue and orange respectively in them. He infers that :
(a) X is HCl solution, Y is NaOH solution
(b) X is acetic acid, Y is sodium carbonate solution
(c) X is sodium carbonate solution, Y is acetic acid
(d) X is oxalic acid, Y is sodium carbonate solution

Answer 1

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(b) X is acetic acid and y is sodium carbonate...


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Answer 2

Answer : The correct option is, (c) X is sodium carbonate solution, Y is acetic acid

Explanation :

pH indicators : It is used to determine the solution is acidic or basic. It gives the visible sign by the color change of a solution.

As there are many indicators which are phenolphthalein, litmus paper, methyl orange, methyl red, etc.

pH : It is defined as the negative logarithm of the hydrogen ion or hydronium ion concentration.

pH measures the acidity and basicity of a substance.

The pH range for acidic solution is, 0.1 to 6.9  and the pH paper turns blue to red.

The pH range for basic solution is, 7.1 to 14  and the pH paper turns red to blue.

For neutral solution the pH is, 7  and pH color always green.

When a student dips pH papers in solution X then the pH paper turns blue that means the solution is basic in nature and when a student dips pH papers in solution Y then the pH paper turns orange that means the solution is acidic in nature.

From the given option, we conclude that the solution X is sodium carbonate and solution Y is acetic acid.

Hence, the correct option is, (C)