What are some property's of acids?

Answer 1

Sour taste, reactivity with metals, and ability to produce color changes in indicators.

They sour and reacts with metal, metal carbonate and bases/alkali. Most of them are corrosive as well. They can change the color of objects like universal indicator (depending on pH, stronger acids will turn universal indicator red while the weaker ones will only turn universal indicator to yellow or orange) and moist blue litmus paper red.