Read the information given in the table and answer the following questions.
Solution
pH Value
Reaction with Phenolphthalein solution
Reaction with Methyl orange solution
HCl
1
No colour change.
Turns into red
Distilled water
7
No colour change. No colour change.
NaOH
13
Turns into pink colour.
Turns into yellow colour.
Lemon juice
2.5
No colour change. Turns into red colour.
NaCl
7
No colour change. No colour change.
Baking Soda
8
Turns into pink colour.
Turns into yellow colour.
(a) List out the acids in the above table.
(b) What is the nature of the solution which gives pink colour with Phenolphthalein solution?
(c) List out the neutral solutions in the above table.
(d) Name the strongest acid and the strongest base among the given solutions.

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Solution

(a) Acids are HCl and lemon juice because the pH is less than 7.
(b) Alkaline or basic solution turns phenolphthalein pink.
(c) Neutral solutions: Distilled water and NaCl.
(d) HCl is the strongest acid and NaOH is the strongest base.

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Q58) Consider the following statements about acid-base indicators.

i) Phenolphthalein gives a pink colour if the solution is acidic.

ii) China rose indicator turns acidic solutions to dark pink.

iii) Blue litmus turns red for a basic solution.

Which of the above statements are true?

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Solution	pH Value	Reaction with Phenolphthalein solution	Reaction with Methyl orange solution
HCl	1	No colour change.	Turns into red
Distilled water	7	No colour change.	No colour change.
NaOH	13	Turns into pink colour.	Turns into yellow colour.
Lemon juice	2.5	No colour change.	Turns into red colour.
NaCl	7	No colour change.	No colour change.
Baking Soda	8	Turns into pink colour.	Turns into yellow colour.