Based on a pH scale, the chemical compound which is classified as an acid is: A. Hydrogen fluoride (HF).
What is a pH scale?
A pH scale can be defined as a tool that is designed and developed for the measurement of the molar concentration of hydrogen ions (H⁺) in both acidic and alkaline (basic) solutions.
This ultimately implies that, a pH scale can be used to measure and specify the acidity, neutrality or basicity of any chemical solution.
In this scenario, the pH of each of the given chemical compound are as follows:
- Hydrogen fluoride (HF): it has a pH of 1.0 but it's a weak acid.
- Potassium hydroxide (KOH): it has a pH of 13 and as such it's a strong base.
- Lithium fluoride (LIF): it has a pH of 7.5 and as such it's neutral.
- Ammonia (NH₃): it has a pH of 10 and as such it's a weak base.
Read more on pH here: brainly.com/question/24233266
