MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryIonic equilibriumPrevious Year Questions

The pH of 10–8 M HCl solution is (AFMC 2008)

A.8

B.more than 8

C.between 6 and 7✓ Correct

D.slightly more than 7

Explanation

Given, concentration of HCl is- 3 CH COOH –5 10 –4 10 –3 10 –2 10 IONIC EQUILIBRIUM 53 + 8 [HCl]=[H ]=10 M The [H ] due to the auto-ionization of water is 7 10 M . So total amount of 8 7 [H ] 10 10 M 7 1 7 10 1 10 1.1 10 x pH = 7 log 1.1 10 6.96 x

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