Alkalis:
An alkali is a type of chemical compound that has a pH greater than 7. Alkalis are also known as bases and are the opposite of acids in terms of their chemical properties. They react with acids to form salts and water, a process known as neutralization.

Properties of Alkalis:
- Alkalis are typically slippery to the touch and can cause skin irritation.
- They have a bitter taste and are often found in cleaning products and soaps.
- Alkalis are good conductors of electricity when dissolved in water, as they produce hydroxide ions (OH-) which are responsible for the conductivity.

Common Alkalis:
- Sodium hydroxide (NaOH): Commonly known as caustic soda, it is used in the manufacture of soaps and detergents.
- Potassium hydroxide (KOH): Also known as caustic potash, it is used in the production of fertilizers and batteries.
- Ammonia (NH3): A weak alkali commonly used in household cleaning products.

Uses of Alkalis:
- Alkalis are widely used in industries such as agriculture, pharmaceuticals, and manufacturing.
- They are used in the production of paper, textiles, and various chemicals.
- Alkalis are also used in water treatment to adjust pH levels and remove impurities.
In conclusion, alkalis are important chemical compounds with a variety of uses in different industries. Their unique properties and ability to neutralize acids make them essential in various applications.