Question

Which comparison is correct?
(1 point)
O HF is a stronger acid than HCI.
O H2S is a stronger acid than HCI.
O PH3 is a stronger acid than NH3.
O NH3 is a stronger acid than HF.

Answer 1

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.

What is the pKa?

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: https://brainly.com/question/13608171