The molarity of a saturated ammonia solution at 15.6 °C (60.1 °F) is approximately 18 mol/L. This specific concentration represents a highly saturated form of ammonia in water, exhibiting distinct physical properties.
Ammonia solution, also known as ammonium hydroxide, is a common reagent in laboratories and industries. Its concentration, and thus its molarity, can vary significantly depending on the amount of ammonia gas dissolved in water. However, for a saturated solution under standard conditions, these properties become quite specific.
Key Characteristics of Saturated Ammonia Solution
A saturated ammonia solution at 15.6 °C possesses several notable characteristics that define its chemical and physical makeup:
- Molarity: As mentioned, its molarity is approximately 18 mol/L. This high molarity indicates a concentrated solution with a significant amount of dissolved ammonia.
- Density: At this temperature, the density of a saturated ammonia solution is 0.88 g/ml. Interestingly, unlike many other solutions, the density of ammonia solutions tends to decrease as the concentration of dissolved ammonia increases. This is because ammonia gas itself is much less dense than water.
- Mass Concentration: The solution contains 35.6% ammonia by mass. This percentage highlights the substantial proportion of ammonia present within the total mass of the solution.
- Ammonia Content per Volume: For every litre of the solution, there are 308 grams of ammonia dissolved. This provides a clear measure of the solute's quantity within a given volume of the solution.
These properties are interconnected and crucial for understanding the behavior and applications of concentrated ammonia solutions.
Summary of Saturated Ammonia Solution Properties (at 15.6 °C)
| Property | Value |
|---|---|
| Molarity | Approximately 18 mol/L |
| Density | 0.88 g/ml |
| Ammonia by Mass | 35.6% |
| Ammonia per Litre of Solution | 308 grams |
| Temperature | 15.6 °C (60.1 °F) |
Understanding Molarity
Molarity is a measure of the concentration of a solute in a solution, expressed as the number of moles of solute per litre of solution (mol/L). It's a fundamental concept in chemistry for quantitative analysis and reaction stoichiometry. For highly concentrated solutions like saturated ammonia, molarity provides a direct indication of the amount of reactant available for chemical processes.
The approximate molarity of 18 mol/L for a saturated ammonia solution signifies its strong basicity and high reactivity, making it a powerful reagent in various industrial and laboratory settings.
