Problem: What is the pH of a 4.2×10–4 M HCl solution at 25°C? A. 2.80B. 3.38C. 3.80D. 4.20E. 4.62

FREE Expert Solution

Remember that HCl is a strong, binary acidRecall that strong acids completely dissociate in water and that acids donate H+ to the base (water in this case). The dissociation of HCl is as follows:


HCl(aq) + H2O(l)  H3O+(aq) + Cl(aq)


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Problem Details

What is the pH of a 4.2×10–4 M HCl solution at 25°C? 

A. 2.80

B. 3.38

C. 3.80

D. 4.20

E. 4.62

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