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Question: What will be the pH value of \(0.02M\) \({H_2}S{O_4}\)solution. A.\(1.7\) B.\(1.4\) C.\(2\) ...

What will be the pH value of 0.02M0.02M H2SO4{H_2}S{O_4}solution.
A.1.71.7
B.1.41.4
C.22
D.44

Explanation

Solution

pH value is used to determine the acid or basic nature. For example: if pH value ranges from 0−70 - 7 then it will be acidic in nature and if its value ranges from 7−147 - 14 then it will be basic in nature.

Complete step by step answer:
pH values: The values used to determine the acidic or basic nature of solutions, are known as pH values. For example: if pH value ranges from 0−70 - 7 then it will be acidic in nature and if its value ranges from 7−147 - 14 then it will be basic in nature. If the pH value for any solution comes out to be 77 then it will be treated as a neutral solution.
Acidic solution: The solutions which are acidic in nature, are known as acidic solutions. The pH values range from 0−70 - 7.
Basic solution: The solutions which are basic in nature, are known as basic solutions. The pH values range from 7−147 - 14.
Neutral solution: The solutions which are neither acidic nor basic in nature, are known as neutral solutions. The pH value for neutral solution is 77.
How to calculate pH value of a solution:
The formula which is used to calculate the pH value of the solution is as pH=−log⁡[H+]pH = - \log [{H^ + }] i.e. pH is defined as the negative logarithm of the concentration of hydrogen ion.
Now if we want to calculate the pH for sulphuric acid i.e. H2SO4{H_2}S{O_4}, then it will be calculated as:
First of all we need to calculate the hydrogen ion concentration. We know that one mole of sulphuric acid will give two moles of hydrogen ion. H2SO4→2H++SO42−{H_2}S{O_4} \to 2{H^ + } + S{O_4}^{2 - }
So, 0.02M0.02M sulphuric acid will give 0.04M0.04M hydrogen ions.
Now, put the value of hydrogen ion concentration value in the pH value formula, then we will get pH as: pH=−log⁡[0.04]=1.4pH = - \log [0.04] = 1.4
So pH will be 1.41.4.
Hence, the correct answer is option B.

Note:
If by the question we are unable to get the concentration of hydrogen ion but we are getting the concentration of hydroxide ion then we can use the formula as pH=−log⁡[OH−]pH = - \log [O{H^ - }] and then pH+pOH=14pH + pOH = 14. This will give you the value of pH.