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Q.

The pH of a solution is 5.0. Its hydrogen ion concentration is decreased by 100 times ,the solutions will be?


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a

More acidic

b

Neutral

c

Unaffected 

d

Basic

answer is C.

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Detailed Solution

detailed_solution_thumbnail
The pH of a solution is 5.0. Its hydrogen ion concentration is decreased by 100 times the solutions will be neutral.
The concentration of hydrogen ions has an inverse relationship with the pH of the solution. If Ph is decreased by 100 times, then pH will increase.
The formula of pH is pH=-log {H+} 
So pH will increase by pH=-log 100 
Hence pH=2.
So new pH will be increased by 2 so it becomes pH=5+2
⇒  7
 
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The pH of a solution is 5.0. Its hydrogen ion concentration is decreased by 100 times ,the solutions will be?