Why is NH4Br Soluble in Water? (+ 3 More Things to Know)

Yes, NH₄Br (Ammonium bromide) is soluble in water. ¹ It is soluble in water because water’s polar molecules can interact with the (NH4)+ and Br- ions, causing NH₄Br to break apart into its ions and become hydrated by water. ²

Well, this was just a simple answer. But there are few more things to know about this topic which will make your concept super clear.

So let’s dive right into it.

Explanation: Why is NH4Br soluble in water?

NH₄Br (also known as ammonium bromide), is soluble in water due to its ionic nature and the strong electrostatic interactions between its constituent ions.

When NH₄Br dissolves in water, it dissociates into ammonium ions (NH4)+ and bromide ions (Br-). The polar water molecules interact with these ions, facilitating their separation and solvation. 

The ammonium ion (NH4)+ has a positive charge and is attracted to the partially negative oxygen atoms in water molecules through electrostatic interactions. These interactions lead to the hydration of the ammonium ion, with water molecules surrounding and stabilizing it.

Similarly, the bromide ion (Br-) has a negative charge and is attracted to the partially positive hydrogen atoms in water molecules. Water molecules form a hydration shell around the bromide ions, effectively solvating them.

The strong interactions between the ions and water molecules overcome the attractive forces within the crystal lattice of NH₄Br, causing the compound to dissolve in water.

Overall, the solubility of NH₄Br in water is a result of the favorable interactions between the ions and the polar solvent molecules, allowing for the separation and dispersal of the ionic compound throughout the water solution.

What factors affect the solubility of NH4Br in water?

The solubility of NH₄Br (ammonium bromide) in water can be influenced by several factors, including temperature, pressure, and the presence of other solutes. ³

Let’s explore each factor in more detail:

1. Temperature: Generally, the solubility of most solid substances, including NH₄Br, tends to increase with an increase in temperature. This is because higher temperatures provide more energy to overcome the intermolecular forces within the solid, making it easier for the compound to dissolve in the solvent (water, in this case). ⁴ As a result, higher temperatures lead to greater solubility of NH₄Br in water.
2. Pressure: For substances that do not undergo significant changes in volume upon dissolution (like NH₄Br), pressure does not have a significant effect on their solubility in water. ⁵ The solubility of NH₄Br is primarily influenced by temperature rather than pressure.
3. Presence of other solutes: The presence of other solutes in the water can affect the solubility of NH₄Br. ⁶ If the other solute molecules interact favorably with NH₄Br, they can compete for the available water molecules, reducing the solubility of NH₄Br. On the other hand, if the other solutes interact less favorably with NH₄Br, they may have little impact on its solubility.
4. pH: The pH of the solution can influence the solubility of NH₄Br. ⁷ In acidic solutions, the ammonium ion (NH4)+ can undergo protonation to form NH3 (ammonia) gas. This reduces the concentration of (NH4)+ ions in solution and may decrease the solubility of NH₄Br.

It’s essential to consider these factors when determining the solubility of NH₄Br in water under different conditions. Solubility charts and tables provide valuable information about how the solubility of various compounds, including NH₄Br, changes with temperature.

Can NH4Br dissolve in other solvents besides water?

Yes, NH₄Br (ammonium bromide) can dissolve in solvents other than water, although its solubility may vary depending on the solvent. NH₄Br is an ionic compound, and its solubility in a particular solvent depends on the nature of the solvent and the interactions between the solvent molecules and the (NH4)+ and Br- ions.

Some solvents in which NH₄Br can dissolve to some extent include: ⁸

• Methanol (CH₃OH): NH₄Br is generally soluble in methanol. Methanol is a polar solvent that can interact with the ionic (NH4)+ and Br- ions, facilitating their separation and dissolution.
• Ethanol (C₂H₅OH): NH₄Br is also soluble in ethanol. Like methanol, ethanol is a polar solvent capable of solvating the (NH4)+ and Br- ions.
• Acetone ((CH₃)₂CO): NH₄Br has some solubility in acetone. Acetone is a polar aprotic solvent, meaning it lacks an acidic hydrogen atom. While it may not solvate NH₄Br as effectively as water or polar protic solvents, it can still dissolve some NH₄Br due to its polarity.

It’s important to note that the solubility of NH₄Br in these solvents may not be as high as in water.

Additionally, solvents with nonpolar or low polarity, such as hexane or toluene, would not be suitable for dissolving NH₄Br due to the lack of strong polar interactions with the ionic compound.

Further reading

Why is CO2 (Carbon dioxide) Soluble in Water?
Why is NH3 (Ammonia) Soluble in Water?
Why is Methanol (CH3OH) Soluble in Water?
Why is Acetone Soluble in Water?
Is Hexane Soluble in Water?

About author

Jay Rana

Jay is an educator and has helped more than 100,000 students in their studies by providing simple and easy explanations on different science-related topics. He is a founder of Pediabay and is passionate about helping students through his easily digestible explanations.

Read more about our Editorial process.

1. Ammonium bromide – Wikipedia. (n.d.). Ammonium Bromide – Wikipedia. https://en.wikipedia.org/wiki/Ammonium_bromide
2. P. (n.d.). Ammonium bromide. Ammonium Bromide | NH4Br | CID 25514 – PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/25514
3. Uiuc.edu http://www.chem.uiuc.edu/rogers/Text11/Tx112/tx112.html
4. Temperature Effects on Solubility. (2015, January 4). Chemistry LibreTexts. https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Equilibria/Solubilty/Temperature_Effects_on_Solubility
5. 13.4: Pressure and Temperature Effects on Solubility. (2016, January 24). Chemistry LibreTexts. https://chem.libretexts.org/Courses/University_of_Arkansas_Little_Rock/Chem_1403%3A_General_Chemistry_2/Text/13%3A_Solutions/13.03%3A__Pressure_and_Temperature_Effects_on_Solubility
6. Solubility – Wikipedia. (2015, April 22). Solubility – Wikipedia. https://en.wikipedia.org/wiki/Solubility
7. 16.4: The Effects of pH on Solubility. (2015, December 27). Chemistry LibreTexts. https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_Principles_of_Modern_Chemistry_(Oxtoby_et_al.)/Unit_4%3A_Equilibrium_in_Chemical_Reactions/16%3A_Solubility_and_Precipitation_Equilibria/16.4%3A_The_Effects_of_pH_on_Solubility
8. P. (n.d.). Ammonium bromide. Ammonium Bromide | NH4Br | CID 25514 – PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/Ammonium-bromide#section=Solubility&fullscreen=true