D: when sodium sulfide dissociates in water, the sulfur ion reacts with water as follows: s-2 + h2o → oh- + sh- which of the following statements is true? na2s is a base because it ionizes to release oh-. na2s is an acid because it is a proton donor. na2s is a base because it increases the hydroxide concentration. none of these

Option (a) is the correct answer.

Explanation:

A base is a substance that gives hydroxide ions () upon dissociation in water. This means that a base increases the hydroxide ion concentration in a solution.

On the other hand, an acid is a substance that gives hydrogen ions () upon dissociation in water. This means that an acid increases the hydrogen ion concentration in a solution.

For example,

Since, sodium sulfide () dissociates to give hydroxide ions.

Hence, we can conclude that is a base because it ionizes to release .

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:

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.