Vintage, lime water apothecary bottle, nice condition. 14 cm height 6 cm wide
 
Lime water generally refers to a solution of calcium hydroxide in water, also known as slaked lime or hydrated lime. It's important to note that lime water can also refer to a solution made with lime fruit (Citrus aurantiifolia), but in a chemical context, the term often relates to calcium hydroxide. Here's more information about both:
 
1. **Calcium Hydroxide (Slaked Lime):**
   - **Chemical Formula:** Ca(OH)₂
   - **Formation:** Produced by mixing calcium oxide (quicklime) with water. The reaction is  exothermic, producing heat.
   - **Properties:** It is a white, powdery solid with low solubility in water, forming a clear solution known as lime water.
   - **Uses:**
     - Agriculture: Used to improve soil quality and adjust pH.
     - Water Treatment: Employed for water softening and wastewater treatment.
     - Construction: Used in mortars and plasters.
 
2. **Lime Water (Citrus Fruit):**
   - **Source:** Lime water can also refer to a beverage made by diluting the juice of lime fruit in water.
   - **Properties:** This type of lime water is a refreshing, slightly tart drink.
   - **Uses:**
     - Culinary: Used in cooking, cocktails, and as a beverage.
     - Health: Lime water is sometimes consumed for its vitamin C content and potential health benefits.
**Preparation of Lime Water (Calcium Hydroxide):**
1. Calcium oxide (quicklime) reacts with water:
   \[ \text{CaO (s)} + \text{H}_2\text{O (l)} \rightarrow \text{Ca(OH)}_2 (aq) \]
2. The resulting solution is lime water, which can be used in various applications.
 
If you are referring to lime water made with lime fruit, it is a tasty and refreshing beverage with a different set of properties and uses. It is a good source of vitamin C and is often enjoyed for its flavor and potential health benefits.