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Acids

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Question

If you visit a gym or fitness center, you will notice that some people are stronger than others. There is a similar situation in the world of acids and bases. Some are stronger than other. For example, $H F$ is classified as a weak acid and $H C l$ is a strong acid.
Which of the following statements gives the best explanation for this difference in acid strength?

The molar mass of

H F

is less than the molar mass of

H C l

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The

H - F

bond requires more energy to break than the

H - C l

bond.

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A solution of

1 M H F

has a lower pH than a solution of

1 M H C l

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The solubility of

H F

in water is less than the solubility of

H C l

in water.

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Solution

The correct option is B The $H - F$ bond requires more energy to break than the $H - C l$ bond.
Acid strength depends on an ability to give a $H^{+}$ , which requires the breakage of the bond
The length of $H - C l$ bond is greater than the $H - F$ bond
$B o n d s t r e n g t h \propto \frac{1}{B o n d l e n g t h}$
Thus, the strength of $H - F$ bond is greater than the $H - C l$ bond.
So, it is easy for $H C l$ to give $H^{+}$ .
So, $H C l$ is the strong acid.

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p H

N H_{4} C l

solution in water is less than

7

and pH of

C H_{3} C C O O N a

solution is more than

7

. Reason:

N H_{4} C l

is a salt of weak base

N H_{4} O H

and strong acid

H C l

whereas

C H_{3} C O O N a

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and strong base

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Q. A

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Reason: In equimolar solution, the number of titrable protons present in HCI is less than that present in acetic acid

Q. Assertion :pH value of

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Q. Give the correct order of initials T or F for following statements. Use T if the statement is true and F if it is false.
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