How does acids taste? 

Sour

The correct answer is option 1. Sour.

The taste of acids is described as sour. This sour taste is a result of the interaction of acids with taste receptors on the tongue. When acidic substances come into contact with the taste buds, they can evoke a sour or tart sensation.

Common examples of acids that exhibit a sour taste include citric acid (found in citrus fruits like lemons and oranges) and acetic acid (found in vinegar). The sensation of sourness is a distinctive characteristic of acids and is used as a qualitative way to identify acidic substances.

While some acids occur naturally in foods and beverages and contribute to their sour taste, it's essential to note that tasting pure acids, especially concentrated or strong acids, is not recommended due to safety concerns. Acids can cause irritation or harm to the mouth, throat, and digestive system. Reliable methods such as laboratory testing or pH indicators should be used to determine the acidity of substances in a safer and more accurate manner.