Why is there a substance in solution, some are molecules, and some are in ionic form

Some substances in solution are in molecular form, ionic in form, and some in both molecular form and ionic form. This is determined by the category of supplies!

When the substance is a non-electrolyte, the force of the water molecules on the non-electrolyte molecules dissolved in water is not as strong as the force between the atoms in the non-electrolyte molecules that make up the molecule, the substance is in the form of molecules in the water;

In the case of a strong electrolyte, the impact force of the water molecules on the strong electrolyte molecules dissolved in water exceeds the force between the atoms in the strong electrolyte molecules and ionizes them, thus existing in the solution in the form of ions. In the case of a weak electrolyte, the impact force of the water molecules on the weak electrolyte molecules dissolved in water is not much different from the force between the atoms in the electrolyte molecules, and can only be partially ionized, so it can exist in both molecular and ionic forms in water.

When the force of a water molecule on a substance dissolved in water is not as strong as the force between the atoms that make up the molecule of the substance, the substance exists in the form of a molecule in water; Otherwise, it exists in ionic form.

What you call a substance can also be said to be a compound, and compounds are divided into ionic compounds and covalent compounds. Most of the ionic compounds are ionic forms in aqueous solution, covalent compounds, and many are composed of molecular forms, which are called strong electrolytes, those that are completely ionic in water are called strong electrolytes, those that are completely composed of molecular forms are called non-electrolytes, and some are called weak electrolytes.

Summary. A molecule is the smallest particle in a substance that can exist independently and maintain all the chemical properties of the substance. Things in the world, such as water, carbon dioxide, grain, copper, iron, aluminum, lime, glass, etc., are all substances, and all of these substances are made up of molecules.

A molecule is the smallest "coarse" of these substances that can exist alone and has all the chemical properties of the substance. Molecules can be large and small, and the size varies greatly. Molecules such as plastics and proteins are very large, known as "polymers", and are giants in the molecular world; However, the molecules of iron and copper are very small, and they are the "little ones" of the molecular world.

Large and small molecules, in turn, are made up of smaller particles - atoms. Atoms are about the same size. The molecules of plastics and proteins are large because they are made up of many atoms; Whereas, the molecules of iron and copper are small because they are made up of just one atom.

Atoms are extremely small, and we often use "sesame seeds so small" to describe "small", and sesame seeds are compared to atoms like the earth and sesame seeds. Between 500,000 and 1,000,000 atoms, one next to the other, lined up in a "long line", is only as long as a hair's diameter.

A molecule is the smallest particle in a substance that can exist independently and maintain all the chemical properties of the substance. The things in the world, such as water, carbon dioxide, grain, copper, iron, aluminum, lime, glass, etc., are all substances, and all of these substances are made up of molecules. The molecule is the smallest "microcoarse" of these substances that can exist alone and has all the chemical properties of this delicate substance.

Molecules can be large and small, and the size varies greatly. Molecules such as plastics and proteins are very large, known as "polymers", and are giants in the molecular world; However, the molecules of iron and copper are very small, and they are the "little ones" of the molecular world. Large and small molecules, in turn, are made up of smaller particles - atoms.

Atoms are about the same size. The molecules of plastics and proteins are large because they are made up of many atoms; The molecules of iron and copper are small because they are only made up of one atom. Atoms are extremely small, and we often use "sesame seeds so small" to describe "small", and sesame seeds are compared to atoms like the earth and sesame seeds.

Between 500,000 and 1,000,000 atoms, one next to the other, lined up in a "long line", is only as long as a hair's diameter.

Whereas the particles of the solute in the solution are mostly ions.

If there are any particles in the sodium hydroxide solution, are there water molecules?

Ions continue to become molecular in solution and then continue to become ionic in a state of dynamic equilibrium.

Some. The particles contained in the sodium hydroxide solution are hydroxide ions, sodium ions, water molecules.

Sodium hydroxide solution is a strong alkaline solution, the ions are in the solution, completely dissociated, and there are no sodium hydroxide molecules.

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Blue: Copper ions. Brownish-yellow: ferric ions. Light green: ferrous ions. Blood-red: ferric thiocyanide trivalent celery (ferric ferric). Purple: permanganate ions.

In aqueous solutions, some ions are colored.

Common colored ions are:

Cu2+ copper ions --- blue.

Fe2+ ferrous ions --- light green.

Fe3+ iron ion -- light purple (generally brownish-yellow in solution).

Mn2+ manganese ions --- light pink.

CO2+ cobalt ions --- pink.

Ni2+ nickel ions --- green.

Cr2 + chromium ion - blue-green.

Cr3 + chromium ion - green.

CD2+ cadmium ion - blue-green.

AU3+ gold ions--- golden yellow.

What exists in ionic form and what exists in molecular form.

1. Ionic compounds exist in the form of ions in the molten state, and strong electrolytes that are easily soluble in water exist in the form of ions in aqueous solutions. 2. Substances in molecular form(1) Gases at room temperature exist in molecular form; (2) Most of the non-metallic elements (except C, Si, and B) exist in molecular form, and many of them exist in the form of double-wide atomic molecules, such as halogen, oxygen, hydrogen, nitrogen, etc. There are also triatomic molecules, such as ozone.

Sodium ion and chloride ion are equivalent to sodium ion hydrate and chloride ion hydrate, these are strong electrolytes in aqueous solution, there is no difference, it can be said to be sodium ion or sodium ion hydrate.

This term hydrated ions is only used to distinguish between ions in an aqueous solution, ions in a molten state, and ions in crystals.

The presence of weak electrolytes in solution is slightly different, with weak ionization and hydrolysis.

When other substances are dissolved in water, the particles generally present are:

Potassium nitrate: nitrate ion, potassium hydrate ion;

Sodium hydroxide: sodium hydrate ion, hydroxide ion;

Hydrochloric acid: hydronium hydrate, chloride hydrate.

That is, there is generally no hydration of the atomic cluster.

Gases, solids, and liquids can all be used as solutes;

There can be multiple solutes in a solution, but only one solvent;

Water is a commonly used solvent, in addition to water, alcohol and gasoline can also be used as solvents;

The solute is present in the solvent in the form of molecules or ions so it is wrong, so D is chosen