How does litmus paper react with an acid?

The main use of litmus is to test whether a solution is acidic or basic. Light blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions,with the color changing occurring over the pH range 4.5-8.3 at 25°C (77°F). Neutral litmus paper is purple

Explanation:

:) it's correct

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

c, liquids evaporate, creating a gas