Formic acid: ants, industry and blood chemistry explored in Chemistry World

Formic acid and its journey from ants to industry

In this Chemistry World podcast, formic acid is unpacked from its discovery in ants to its positions as a versatile chemical used in biocides, leather tanning, cleaning, and as a potential hydrogen storage molecule, with detours into ecological interactions and medical cautions. The episode also highlights a blood chemistry thread, explaining how haemoglobin gives red blood cells their color and transports oxygen around the body.

• Ant-origin of formic acid and the historic ant distillation experiment
• Industrial roles including leather tanning and cleaners
• Stability, storage possibilities and biological interactions
• Link to blood chemistry via haemoglobin and red-blood-cells

Origins of formic acid and its early discovery

The podcast traces the origin of formic acid to the 17th century, when the naturalist John Ray distilled ants and observed the red staining of chicory flowers, an early natural litmus test for acidity. Ray’s observations eventually connected to methanoic acid, named for the ants that donated the acidic juice. This section contextualizes formic acid as a historically important chemical whose simple source belies a wide range of modern applications.

Formic acid as a versatile chemical

Formic acid is portrayed as a multifunctional compound described by Chemistry World as a biocide, an industrial cleaner and descaler, and a key player in leather processing via pickling. The discussion highlights how formic acid opens collagen fibres during tanning, enabling reagent access to the hide and leading to a more workable final product. The narrative notes that the calcium salt of formic acid is highly soluble compared with some other acids, a property that contributes to its utility in industry.

Beyond tradition: potential energy storage and ecological roles

The episode discusses formic acid as a potential storage molecule for hydrogen, a concept tied to catalytic decomposition to carbon monoxide and water and, under certain conditions, to carbon dioxide and hydrogen. While the formic acid pathway offers a green cleaning option, the conversation also touches on the ecological dimension of formic acid, including how ants deploy this chemical as part of their defence mechanisms and how some birds may exploit formic acid through anting to control parasites.

Therapies and cautions

In a nod to non-traditional uses, the podcast mentions that some alternative therapists have advocated formic acid for rheumatic conditions, tb, and arthritis, though these views sit far from mainstream scientific consensus. The discussion underscores that, in scientific and industrial practice, formic acid is primarily valued for preservation, cleaning, and its role in leather processing, with ongoing exploration of its environmental footprint and safe handling.

Connection to haemoglobin and the blood story

The program transitions to the bloodstream, explaining that the red coloration of blood is due to haemoglobin, a vertebrate-wide oxygen carrier. The discussion clarifies that haemoglobin serves as a gas tanker across vertebrates, linking chemistry to physiology. The segment closes with a tease for next week, inviting listeners to learn more about haemoglobin and related blood-oxygen transport mechanisms.