Question

What is the acid dissociation constant (Ka​) for formic acid (HCOOH)?

A) 1.8×10−4
B) 4.1×10−8
C) 2.3×10−5
D) 7.6×10−3

Answer 1

The acid dissociation constant (Ka) for formic acid (HCOOH) is 1.8×10⁻⁴. This value indicates the degree of ionization of the acid in water and determines its strength as an acid.The correct option is a.

Step-by-step explanation:

The acid dissociation constant (Ka) for formic acid (HCOOH) can be found by consulting tables that list the Ka values for various acids. From the information provided, which resembles such references, the Ka value for formic acid is given as 1.8×10⁻⁴. Therefore, the correct answer to the question is A) 1.8×10⁻⁴.

Understanding the acid dissociation constant is crucial for determining the strength of an acid. A larger Ka value indicates a stronger acid because it implies a greater degree of ionization in water. With this information, students and chemists can calculate the pH of solutions, understand acid-base equilibria, and make informed decisions in experimental design and analysis.