Chemistry, 01.09.2019 12:20, amoore51

As k2o dissolves in water, the oxide ion reacts with water molecules to form hydroxide ions. write the molecular and net ionic equations for this reaction. based on the definitions of acid and base, what ion is the base in this reaction

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answered: jeurycruz15p6vpch

Solution:

The molecular equation is:

$K_2O(aq.)+H_2O(l)\rightarrow 2KOH(aq.)$

Now, the oxide ion reacts with water to produce hydroxide ions,

The ionic equation is:

$2K^+(aq.)+O^{2-}(aq.)+H_2O(l)\rightarrow 2K^+(aq.)+2OH^-(aq.)$

The 2K^+ ions are present on both the sides, so the net ionic equation becomes,

$O^{2-}(aq.)+H_2O(l)\rightarrow 2OH^-(aq.)$

Now, to determine acid and base, we will look at the definitions

Acid: It is defined as proton donor that is it donates H^+ ions.

Base: It is defined as proton acceptor that is it accepts H^+ ions.

In the ionic equation, water is donating H^+ ions to $O^{2-}$ therefore it acts as an acid and oxide ion acts as a base.

answered: Guest

water molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation:

answered: Guest

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As k2o dissolves in water, the oxide ion reacts with water molecules to form hydroxide ions. write t...