Ph Of NH3: 5 Factors You Should Know!

What is the pH of NH3?

The pH of NH3 is around 11, showing that it is alkaline in nature. It is used to neutralize the acid. 

How can I measure the pH of NH3?

Measuring the pH of NH3 is an important process to ensure its effectiveness in various applications. Here are the steps to measure the pH of NH3:

  1. Prepare the sample: The first step is to prepare the sample of NH3. This involves diluting the NH3 solution with distilled water to a desired concentration.
  2. Calibration of the pH meter: Before measuring the pH of the NH3 solution, it is important to calibrate the pH meter. This involves adjusting the pH meter to read a known pH value using calibration solutions.
  3. Measurement of pH: Once the pH meter has been calibrated, it can be used to measure the pH of the NH3 solution. The pH meter should be dipped into the solution and allowed to stabilize before taking a reading.

What are the implications of the pH of NH3?

NH3 basicity has multiple significant implications in chemistry, biology, and environmental science. 


  • In chemistry, NH3 is used as a reagent. 
  • It can act as a nucleophile, a Lewis base, and a reducing agent. 
  • The basicity of NH3 makes it an important ligand in coordination chemistry, forming metal-NH3 complexes. 
  • The basicity of NH3 is also used in the synthesis of organic compounds like amines.


  • In biology, NH3 is a waste product of protein metabolism and is toxic to cells. 
  • In humans, NH3 is converted into urea in the liver and excreted in the urine. 
  • However, NH3 toxicity can occur in conditions like liver failure, leading to an NH3 buildup in the bloodstream and causing symptoms like confusion and coma.

Environmental science:

  • In environmental science, NH3 is an important pollutant in the air and water.
  • NH3 emissions from agricultural and industrial sources can contribute to acid rain, eutrophication of water bodies, and respiratory problems. 
  • The basicity of NH3 also plays a role in the pH regulation of soils, affecting plant growth and nutrient availability.

Why is the pH of NH3 important?

The pH of NH3 is important because it can affect the solubility, reactivity, and biological activity of NH3 and its derivatives in various applications, like agriculture, wastewater treatment, and pharmaceuticals. For example, in agricultural applications, the pH of the soil can affect the availability of NH3 for plant uptake, which can impact crop yield and quality.

Factors Affecting the pH of NH3

The pH of NH3 can be affected by several factors, including:

  1. The concentration of NH3: The pH of a solution containing NH3 depends on the concentration of NH3 present. As the concentration of NH3 increases, the pH of the solution will become more basic.
  2. Temperature: The pH of NH3 can also be affected by temperature. As the temperature increases, the solubility of NH3 in water decreases, which can lead to a decrease in the concentration of NH3 and an increase in pH.
  3. Pressure: The pressure of the NH3 gas above the solution can affect the solubility of NH3 in water, which can, in turn, affect the pH of the solution.
  4. Presence of other ions: The pH of NH3 can be influenced by the presence of other ions in the solution. For example, the presence of a strong acid, such as hydrochloric acid (HCl), can react with NH3 to form NH4Cl, which will decrease the pH of the solution.
  5. Presence of buffers: Buffers are substances that can resist changes in pH. If a buffer is present in the solution, it can help maintain a relatively constant pH even if there are changes in the concentration of NH3 or other ions.

About the author

I am Leena Raswant, a chemistry postgraduate. I thrive on challenges and continually specified goals. I aim to learn, unlearn, relearn and spread my knowledge in the best possible ways.

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