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What is the pH of 1M HCl?
(A) 0
(B) 1
(C) 2
(D) 3

Answer
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Hint: The formula to find the pH of the solution is as below.
pH=log[H+]
Hydrochloric acid is a monoprotic acid, so it will give one proton upon dissociation in water.

Complete step by step solution:
We will first see how HCl dissociates in order to find how many protons it can give. Then, we will use the formula of pH in this solution.
-HCl will dissolve into proton and chloride ions upon dissociation in aqueous media. The reaction can be given as:
HCl(aq)H+(aq)+Cl(aq)
-We can see that one mole of HCl gives one mole of H+ ions. So, here we are given that the concentration of HCl in the solution is 1M. So, upon its dissociation, it will give 1M H+ ions. Now, this concentration of H+ ions will be useful in determining the pH of the solution.
The formula to find the pH of the solution is as below.
pH=log10[H+]
We have already obtained that the concentration of H+ ions in the solution will be equal to 1M. So, we will put that value in the formula of pH. So, we get
pH=log10[1]
Now, we can write 1 as 100 because 1=100. So,
pH=log[100]
Now, we know that log[10x]=x. So,
pH=0
Thus, we obtained that pH of the 1M solution of HCl is 0.

So, the correct answer is (A).

Note: Do not get confused as the answer is zero because Sorenson proposed a pH scale of 1 to 14. It is possible for a 1M solution of HCl that the pH is zero. Actually if the concentration increases than 1M for HCl solution, then pH we obtain is in a negative value.

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