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Basic Buffer Action

The pH of bas...

Question

The pH of bases lies between 7 and ____.
14

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Solution

The correct option is A 14
pH is a numerical value ranging from 0 to 14 that indicates whether a given substance is acidic, basic or neutral.

pH between 0-7 implies acidic substance

pH = 7 implies neutral substance

pH between 7-14 implies basic/alkaline substance

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Q. Choose the correct from the following:
(i) Salt of a strong acid and a strong base are neutral with pH value of 7.
(ii) Salt of a strong acid and a weak base are basic with pH value more than 7.
(iii) SaIt of a weak acid and a strong base are acidic with pH value less than 7.

Q. Assertion :The

p H

N H_{4} C l

solution in water is less than

7

C H_{3} C C O O N a

solution is more than

7

N H_{4} C l

is a salt of weak base

N H_{4} O H

and strong acid

H C l

C H_{3} C O O N a

is a salt of a weak acid

C H_{3} C O O H

and strong base

N a O H

.

Assertion: The buffer HCOOH/HCOONa will have pH lesser than 7.

Reason: Conjugate base of a weak acid is a strong base.

10^{- 6}

M NaOH is diluted 100 times. The pH of the diluted base is

Q. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. It is carefully regulated by a number of homeostatic mechanisms, which exert their influence principally through the respiratory system and the urinary system in order to control the acid-base balance and respiration. What is the normal pH level of blood of a normal person?

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