
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.
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:
-We can see that one mole of HCl gives one mole of ions. So, here we are given that the concentration of HCl in the solution is 1M. So, upon its dissociation, it will give 1M ions. Now, this concentration of ions will be useful in determining the pH of the solution.
The formula to find the pH of the solution is as below.
We have already obtained that the concentration of ions in the solution will be equal to 1M. So, we will put that value in the formula of pH. So, we get
Now, we can write 1 as because . So,
Now, we know that . So,
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.
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:
-We can see that one mole of HCl gives one mole of
The formula to find the pH of the solution is as below.
We have already obtained that the concentration of
Now, we can write 1 as
Now, we know that
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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