Which of the following statements are true about a strong base and a weak base at a pH of 11?
A) HCl will not bring the pH of either solution to pH 7.
B) Both bases require the same amount of HCl to reach pH 7 because they are both at the same initial pH.
C) The weak base will require less HCl to bring the pH to 7 than the strong base.
D) The strong base will require less HCl to bring the pH to 7 than the weak base.
I'm thinking C but not completely sure. help!!
Answer is D.
Weak bases do not fully dissociate in solution, whereas strong ones do.
At equivalent basic pH values, there is more weak base in solution than strong base.
More base in solution will require more HCl to reach the pH of 7.
[Capitalization and punctuation added. 7/28/20]
To determine which of the statements are true about a strong base and a weak base at a pH of 11, let's analyze each statement:
A) HCl will not bring the pH of either solution to pH 7.
This statement is true for both the strong base and the weak base. HCl is a strong acid, and when it reacts with a strong or weak base, it will undergo a complete neutralization reaction. As a result, the pH of the solution will be brought to 7.
B) Both bases require the same amount of HCl to reach pH 7 because they are both at the same initial pH.
This statement is false. The initial pH of the solutions is the same, but the strength of the base affects the amount of acid required for neutralization. A strong base ionizes completely in water, whereas a weak base only partially ionizes. Therefore, a strong base requires more acid to neutralize it completely, compared to a weak base.
C) The weak base will require less HCl to bring the pH to 7 than the strong base.
This statement is true. As explained earlier, a weak base requires less acid to neutralize it completely compared to a strong base. Therefore, the weak base will require less HCl to bring the pH to 7.
D) The strong base will require less HCl to bring the pH to 7 than the weak base.
This statement is false, as discussed in statement C. The strong base requires more acid to neutralize it completely, so it will require more HCl to bring the pH to 7 compared to the weak base.
Based on the analysis, the correct statement is C) The weak base will require less HCl to bring the pH to 7 than the strong base.
I think it is a poor question and poorly worded at that.
A is false. I know that if I add ENOUGH HCl I can get the pH of either even below 7. A shouldn't even be on as an answer.
Of those answers left I would go with C. To be honest about it I'm confused with the wording of all of the answers.