QQuestionChemistry
QuestionChemistry
Which one of the following is a weak acid?
Select one: A. HC^104
B. HNO^3
C. HCI
D. HI
E. HF
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Answer
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Step 1:: To identify a weak acid, we need to understand the concept of acid strength.
The strength of an acid is determined by its dissociation constant (Ka). A weak acid has a smaller Ka value, which means it only partially dissociates in water.
Step 2:: Now, let's look at the Ka values of the given acids:
A. HC^104 (perchloric acid) has a Ka value of about 10^10 B. HNO^3 (nitric acid) has a Ka value of about 20 C. HCI (hydrochloric acid) has a Ka value of around 10^7 D. HI (hydroiodic acid) has a Ka value of around 10^(- 7) E. HF (hydrofluoric acid) has a Ka value of around 10^(- 4)
Step 3:: Based on the given Ka values, HF has the smallest Ka value, which indicates that it is a weak acid.
Final Answer
HF is a weak acid.
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