Which of the following Ka values represents the weakest acid?A.Ka = 1.82 10−1B.Ka = 1.29 10−4C.Ka = 1.62 10−12D.Ka = 3.24 10−7

To determine which of the given Ka values represents the weakest acid, we need to understand that a smaller Ka value indicates a weaker acid.

1. ### Break Down the Problem

• We are given four different Ka values.
• We need to compare them to identify which one is the smallest.

2. ### Relevant Concepts

• The acid dissociation constant (Ka) measures the strength of an acid in solution.
• A lower Ka value means the acid is weaker and dissociates less in solution.

3. ### Analysis and Detail

• The given Ka values are:
  • A. $K_a = 1.82 \times 10^{-1}$
  • B. $K_a = 1.29 \times 10^{-4}$
  • C. $K_a = 1.62 \times 10^{-12}$
  • D. $K_a = 3.24 \times 10^{-7}$

We can compare these values directly:

• $1.82 \times 10^{-1} = 0.182$
• $1.29 \times 10^{-4} = 0.000129$
• $1.62 \times 10^{-12} = 0.00000000000162$
• $3.24 \times 10^{-7} = 0.000000324$

4. ### Verify and Summarize

• The smallest value among these is $1.62 \times 10^{-12}$, indicating that this corresponds to the weakest acid.

Final Answer

The weakest acid is represented by C. $K_a = 1.62 \times 10^{-12}$.