pH of Salts


 
 
Concept Explanation
 

pH of Salts

The pH Scale:

If we have two acidic solutions, then which is more acidic. Similar is the case with basic solutions. This problem is solved by using a scale known as the pH scale introduced by S P Sorensen in 1909. pH of a solution indicates which solution is more acidic or more basic than the other. The acidity or basicity (alkalinity) of a solution is usually expressed in terms of a function of the H+ ion concentration. This function is called the pH of a solution. The pH of an aqueous solution is the negative logarithm of its H+ ion concentration.

Some Facts:

[H^+] and [OH^-] denote the concentrations of H^+ and OH^-ions respectively. The concentrations of H^+ and OH^- ions in aqueous solutions are usually very small numbers and therefore difficult to work with. Since pH is the negative logarithm of [H^+], we get positive numbers and the inconvenience of dealing with small numbers is eliminated. It should be noted here that pH is only a number, because we can take the logarithm of a number and not of a unit. Therefore, pH of a solution is a dimensionless quantity.

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Sample Questions
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Question : 1

The ___________________________ of a solution is usually expressed in terms of a function of the H+ ion concentration.

Right Option : D
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Question : 2

The pH of an alkaline solution is more than _______________________.

Right Option : C
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Question : 3

Which of the following are correct :

(a) The acidity or basicity (alkalinity) of a solution is usually expressed in terms of a function of the H+ ion concentration.

(b) pH of a solution indicates which solution is more acidic or more basic than the other.

(c)  pH scale introduced by S P Sorensen in 1909.

Right Option : D
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Explanation
 
 
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