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Ad libitum [116K]
3 years ago
14

Which comparison is correct?

Physics
1 answer:
AleksandrR [38]3 years ago
4 0

Considering their pKa, we can affirm that PH₃ is a stronger acid than NH₃.

We want to compare the strength of different acids. To do so, we need to compare their pKa.

<h3>What is the pKa?</h3>

The pKa is the negative base 10 logarithm of the acid dissociation constant, Ka.

The lower the pKa, the stronger the acid.

Which comparison is correct?

  • HF is a stronger acid than HCI. FALSE. The pKa of HF is 3.1. and the pKa of HCl is 6.0.
  • H₂S is a stronger acid than HCI. FALSE. The pKa₁ of H₂S is 7.04. and the pKa of HCl is 6.0.
  • PH₃ is a stronger acid than NH₃. TRUE. The pKa of PH₃ is -5.5  and the pKa of NH₃ is 9.9.
  • NH₃ is a stronger acid than HF. FALSE. The pKa of NH₃ is 9.9 and the pKa of HF is 3.1.

Considering their pKa, we can affirm that PH₃ is a stronger acid than NH₃.

Learn more about pKa here: brainly.com/question/13608171

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