The compound SnCl2·5H2O is known as the bitter of tin. Here's an explanation of why this compound is called the bitter of tin:

- The composition of the compound:
The compound SnCl2·5H2O consists of one tin (Sn) atom, two chloride (Cl) ions, and five water (H2O) molecules. The molecular formula indicates that there are five water molecules associated with each tin(II) chloride.

- Appearance and properties:
The compound SnCl2·5H2O is a white crystalline solid with a bitter taste. It is highly soluble in water and undergoes hydrolysis in the presence of moisture. The hydrolysis of SnCl2·5H2O results in the formation of SnCl4, which is a strong oxidizing agent.

- Bitter taste:
The compound SnCl2·5H2O is called the bitter of tin because of its bitter taste. When dissolved in water, it imparts a bitter flavor. This bitter taste is attributed to the presence of tin(II) ions in the solution. These ions can interact with taste receptors on the tongue, leading to the perception of bitterness.

- Applications:
The bitter of tin is used in various applications, including electroplating, dyeing, and as a reducing agent. It is also used in the synthesis of other tin compounds and as a catalyst in chemical reactions.

In summary, the compound SnCl2·5H2O is called the bitter of tin due to its bitter taste when dissolved in water. This compound has various applications in different industries.