Question

Consider the following statements: (a) Both acids and bases change colour of all indicators. (b) If an indicator gives a colour change with an acid, it does not give a change with a base. (c) If an indicator changes colour with a base, it does not change colour with an acid. (d) Change of colour in an acid and a base depends on the type of the indicator Which of these statements are correct? (i) All four (ii) a and d (iii) b, c and d (iv) only d​

Answer 1

Answer:

(iv) only d is correct

Explanation:

There is a colour change of an acid or a base when an indicator is added to it and it depends on the pH of the indicator which is an important criteria for the colour change of the acidic or the basic solution. pH of the indicator phenolphthalein is 8.2 to 10, so in acidic medium which is having the pH of below 7, it is colourless, after it reaches the pH of 8.2 and above, in basic medium it changes into pink colour.

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