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Fun with Indicators

8 MinsChemistry
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QUICK SUMMARY WITH STORIES

Important Questions

You have two solutions, and . The of solution is and of solution is . Which solution has more hydrogen ion concentration? Which of this acidic and which one is basic?

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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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State whether the following statements are true or false. Correct the false statements.

Phenolphthalein is a natural indicator.

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Phenolphthalein is a synthetic indicator and its color in acidic and basic solutions, respectively are: 

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Name the acid present in an ant sting and give its chemical formula. Also give the common method to get relief from the discomfort caused by the ant sting.

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Which of the following statement is correct about an aqueous solution of an acid and a base?
(i) Higher the pH, stronger the acid.
(ii) Higher the pH, weaker the acid. 
(iii) Lower the pH, stronger the base. 
(iv) Lower the pH, weaker the base. 

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Calcium phosphate is present in tooth enamel, its nature is:

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Turmeric is a natural indicator. On adding its paste to acid and base separately, which color would be observed ?

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Which of the following is acid-base indicator?

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On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?

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