pH of Salts
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:
and
denote the concentrations of
and
ions respectively. The concentrations of
and
ions in aqueous solutions are usually very small numbers and therefore difficult to work with. Since pH is the negative logarithm of
, 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.
The pH of an alkaline solution is more than _______________________. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) In a pH scale, Acidic solutions have pH less than 7. (b) In a pH scale, Neutral solutions or pure water has pH equal to 7. (c) In a pH scale, Basic solutions have pH less than 7. | |||
| Right Option : A | |||
| View Explanation | |||
pH scale iwas ntroduced by __________________________ in 1909. | |||
| Right Option : A | |||
| View Explanation | |||
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