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Acids

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Question

What will be the value given by universal indicator for neutral solution?
7

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Solution

The correct option is A 7
Universal indicator is used to examine whether a substance is acidic or basic. For acidic solution, the range is 0 to 6. For neutral solutions the value is 7. For basic or alkaline solution, range is 8 to 14.

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Q. (a) What is a universal indicator? For what purpose is it used?
(b) How does a universal indicator work?
(c) Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to a test-tube containing water?

Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.

(a) What will be the action of solution A on litmus?

(b) What will be the action of solution B on litmus?

(c) Name any two substances which can give solutions like A.

(d) Name any two substances which can give solutions like B.

(e) What sort of reactions takes place when solution A reacts with solution B?

Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.

(a) What will be the action of solution A on litmus?

(b) What will be action of solution B on litmus?

(c) Name any two substances which can give solutions like A.

(d) Name any two substances which can give solutions like B.

(e) What sort of reaction takes place when solution A reacts with solution B?

Q. Four solutions A, B, C and D when tested with universal indicator showed pH as

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Q. In an experiment to measure the pH values by using a universal indicator, a student found that the pH values of four given solutions A, B, C and D are 10, 6, 2 and 14 respectively. The solution which will require the maximum volume of sodium hydroxide solution for complete neutralisation is solution :
(1) A
(2) B
(3) C
(4) D

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