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Formic acid

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Identification
Molecular formula
CH2O2
CAS number
64-18-6
IUPAC name
ammonia;formic acid
State
State

At room temperature, formic acid is a liquid. It is one of the simplest and most corrosive carboxylic acids, and it readily mixes with water and many polar organic solvents.

Melting point (Celsius)
8.40
Melting point (Kelvin)
281.55
Boiling point (Celsius)
100.80
Boiling point (Kelvin)
373.95
General information
Molecular weight
46.03g/mol
Molar mass
46.0250g/mol
Density
1.2200g/cm3
Appearence

Formic acid is a colorless liquid with a pungent, penetrating odor. It is known for its sharp smell and can cause irritation to the nose and eyes when inhaled. Formic acid is the simplest carboxylic acid, and its liquid form is often found in nature, notably in ant venom.

Comment on solubility

Solubility of Ammonia and Formic Acid

Ammonia (NH3) and formic acid (HCOOH) are both highly soluble in water, making them interesting compounds in various chemical processes.

Ammonia

The solubility of ammonia in water is remarkable, with its solubility at 0°C reaching approximately 35.0 g/100 mL. This high solubility is due to:

  • Hydrogen bonding with water molecules
  • Ammonia's ability to act as a weak base, allowing for easy ionization
  • Its low molecular weight, which facilitates rapid dissolution

As it dissolves, ammonia undergoes hydrolysis to form ammonium ions (NH4+) and hydroxide ions (OH-), which contributes to the solution's basicity.

Formic Acid

Similarly, formic acid showcases excellent water solubility at roughly 100 g/100 mL. Factors contributing to its high solubility include:

  • The presence of a carboxyl group that can form hydrogen bonds
  • Its strong polar characteristics
  • High affinity for water due to its ability to ionize into formate ions (HCOO-) and hydronium ions (H3O+) in solution

Thus, when discussing solubility, both ammonia and formic acid serve as prime examples of compounds that dissolve readily in water, reflecting their chemical nature and interactions with solvent molecules.

Interesting facts

Ammonia

Ammonia, known as one of the simplest nitrogenous compounds, has an array of fascinating characteristics and applications that make it a significant substance in both chemistry and industry. Here are some intriguing facts:

  • Essential for Life: Ammonia is a nitrogen source for many organisms, playing a fundamental role in biological nitrogen fixation.
  • Industrial Importance: It is a critical component in the production of fertilizers, which are vital for global agriculture. The Haber process, which synthesizes ammonia from nitrogen and hydrogen, is a landmark of industrial chemistry.
  • Household Uses: Ammonia is commonly found in cleaning products due to its ability to dissolve dirt and grime effectively.
  • Environmental Impact: While it plays a part in natural cycles, excess ammonia can contribute to environmental issues like water pollution and air quality concerns.
  • State of Matter: At room temperature, ammonia exists as a gas, but it can be easily liquefied under pressure, making it transportable and convenient for various applications.

As the chemist and Nobel laureate Fritz Haber famously said, “The greatest invention of the 20th century was the Haber-Bosch process,” highlighting the significance of ammonia in feeding the world.

Formic Acid

Formic acid, the simplest carboxylic acid, is a compound that intrigues both chemists and biologists due to its diverse applications and biological significance. Here are some compelling details:

  • Natural Occurrence: Formic acid is naturally produced by ants, hence its name, derived from the Latin word "formica" meaning ant. This compound is what gives ant bites their characteristic pain!
  • Industrial Use: It is extensively used in leather production, textile dyeing, and as a preservative in livestock feed, showcasing its versatility in various sectors.
  • Biochemical Relevance: Formic acid is an important intermediate in many metabolic processes in living organisms, specifically in the anaerobic respiration of some bacteria.
  • Simplifying Formulations: In laboratories, formic acid is often used as a solvent and reagent due to its capacity to dissolve many ionic and organic compounds.
  • Safety Considerations: Despite its utility, it is also important to handle formic acid with care as it can be a corrosive substance, emphasizing the critical balance between its use and safety.

As the renowned chemist Auguste Laurent put it, “The study of chemistry is a means to understanding life,” and formic acid beautifully embodies this by intertwining nature, industry, and biochemistry.

Synonyms
Formic acid (ammonium salt)
Ammoniumformiat
Ammonium formate, 96%
Ammonium formate, 99.9%
CHEMBL3971228
Ammonium formate, purum, >=98%
AKOS015903408
Ammonium formate, reagent grade, 97%
BP-31032
Ammonium formate, SAJ first grade, >=95.0%
Ammonium formate, >=99.995% trace metals basis
Ammonium formate, for mass spectrometry, >=99.0%
Ammonium formate, anhydrous, free-flowing, Redi-Dri(TM), reagent grade, 97%