Which Acid Is the Weakest

question 75

Multiple Choice

Which acid is the weakest?

• A)Hydrogen sulfate ion HSO₄^- (K_a = 1.2 × 10^-2)
• B)Hydrocyanic acid HCN (K_a = 4.9 × 10^-10)
• C)Hydrofluoric acid HF (K_a = 7.2 × 10^-4)
• D)Ammonium ion NH₄⁺ (K_a = 5.6 × 10^-10)

---

Definitions:

Directionality Problem

An issue in correlational studies where it is unclear which variable causes changes in the other.

Third Variable Problem

A challenge in research where a correlation between two variables may be explained by the presence of a third variable that influences both.

Random Error

Variability in measurement or data that arises from unpredictable fluctuations during the data collection process.

Selection Bias

A type of error that occurs when the sample is not representative of the population being studied, potentially leading to skewed results.