Water chemistry. Molecule and properties

09/04/2026

The online water chemistry simulations on this page will help you to learn about this very important compound of nature. We will examine what the water molecule is like, what are some of its main chemical properties and we will see in a practical way the phase changes of water changes state, how it is distilled and what is the electrolysis of water..

What is water chemistry

Water is an odorless, colorless and tasteless substance. It is a chemical compound essential for life, with unique and diverse properties that make it crucial for a wide range of processes and applications.

Water chemistry is the branch of chemistry dedicated to the study of the properties, structure and behavior of this essential compound for life. This field analyzes from its molecular composition to its interaction with other substances, covering processes such as dissolution, ionization and changes of state. It also explores its role in biological, industrial and environmental systems, being crucial to understand phenomena such as the formation of solutions, chemical reactions in aqueous media and its function as a thermal regulator on the planet.

Water molecule

The water molecule is composed of two hydrogen atoms and one oxygen atom, which is represented by the chemical formula H₂O. It is a polar compound, which means that the electrical charge is distributed unequally between the hydrogen and oxygen atoms.

Chemical properties of water

The chemical properties of water are extraordinary and make it a unique and essential compound for life on Earth. Its ability to dissolve various substances, act as a thermal regulator and participate in chemical reactions makes it indispensable in biological, industrial and environmental processes. These characteristics arise from its molecular structure and the bonds formed between its molecules, which generate behaviors that not only guarantee the existence of living beings, but also enable countless scientific applications and discoveries.

Water as a universal solvent

Water is a universal solvent, that is, it has the ability to dissolve a wide variety of substances, including salts, sugars, gases and other organic and inorganic compounds. This property is due to the ability of the opposite poles of water molecules to attract and surround the ions and molecules of other substances, separating and dissolving them in solution.

Water as an amphoteric compound

Water is also an amphoteric compound and therefore can act as either an acid or a base. This is due to the ability of water molecules to ionize, releasing hydrogen ions (H+) and hydroxide ions (OH-) into solution. When an acid is dissolved in water, an excess of H+ ions is produced, while when a base is dissolved, an excess of OH- ions is produced.

Heat capacity of water

Water also has a high heat capacity so a large amount of energy is required to raise its temperature. The reason lies in the bonding forces between water molecules, which absorb energy on heating and release it on cooling.

In summary, the online water chemistry simulations on this page are an excellent tool to learn more about the physical and chemical properties and characteristics of water and the water molecule.

Explore the exciting STEM world with our free, online, simulations and accompanying companion courses! With them you’ll be able to experience and learn hands-on. Take this opportunity to immerse yourself in virtual experiences while advancing your education – awaken your scientific curiosity and discover all that the STEM world has to offer!

Water Chemistry Simulations

Molecule
Phase
Distillation
Electrolysis

Water molecule

In the first of our online water chemistry simulations we can see that water molecule is composed of two hydrogen atoms and one oxygen atom joined by a covalent bond. That is, the two hydrogen atoms and the oxygen atom are bonded together by sharing electrons. Its formula is H2O.

Water

H₂O

Single bond

Double bond

Triple bond

Wedge bond

Hash bond

Phase changes of water

This animation shows what happens when heat is applied to a block of ice. Notice that the temperature increases until it reaches 0ºC, where it remains stable while the ice melts. The same thing happens at 100°C as the liquid water evaporates.

Water distillation

This simulation shows a water distillation unit with different cooling variants.

Electrolysis of water

The electrolysis of water is the decomposition of water (H2O) into the gases oxygen (O2) and hydrogen (H2) by means of a direct electric current. To reduce the resistance to the passage of current through water, it is usually acidified by adding a small amount of sulfuric acid or by adding a strong electrolyte such as sodium hydroxide, NaOH.

Giants of science

“If I have seen further, it is by standing on the shoulders of giants”

Isaac Newton

Marie Curie

1867

–

1934

Marie Curie discovered the elements polonium and radium, introduced the concept of radioactivity, and pioneered nuclear chemistry, demonstrating that atoms were not indivisible

“In life, there is nothing to be afraid of, only to understand”

Robert Boyle

1627

–

1691

Robert Boyle formulated the first quantitative law of gases, showing the relationship between pressure and volume, laying foundations of modern chemistry and fluid mechanics

“Air is as necessary to life as food”

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William Henry

1774

–

1836

William Henry formulated Henry’s Law, describing how the amount of gas dissolved in a liquid is proportional to its partial pressure

“Chemistry reveals the hidden secrets in the invisible”

Robert Boyle

1627

–

1691

Robert Boyle formulated the first quantitative law of gases, showing the relationship between pressure and volume, laying foundations of modern chemistry and fluid mechanics

“Air is as necessary to life as food”

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Test your knowledge

What does the chemistry of water study, and why is this compound so important in natural and industrial systems?

The chemistry of water studies its molecular structure, its physical and chemical properties, and its behavior in different environments, from biological systems to industrial processes, because water is an essential compound whose ability to dissolve substances, regulate temperature and participate in chemical reactions makes it an indispensable medium for life and for numerous technological applications. Its odorless, colorless and tasteless nature, together with its polarity and its ability to form bonds between molecules, explains why it takes part in phenomena such as solution formation, ionization, changes of state and the planet’s thermal regulation, which makes it a central subject of study in chemistry and environmental sciences.

What is the molecular structure of water, and what implications does its polarity have for its chemical behavior?

A water molecule is made up of two hydrogen atoms and one oxygen atom joined by covalent bonds, and its bent geometry creates an uneven distribution of charge that makes it a polar molecule, allowing its positive and negative regions to interact with ions and other substances. This polarity explains its remarkable ability to dissolve both organic and inorganic compounds, its role in chemical reactions that occur in aqueous environments, and the formation of bonds between water molecules, which influence properties such as surface tension, cohesion and the high heat capacity that characterizes this compound.

Why do people call water a “universal solvent”? It sounds like it can dissolve everything.

It’s called that because its polarity lets it surround and separate many different substances, so its molecules arrange themselves around ions or compounds and disperse them in the solution, although that doesn’t mean it can dissolve absolutely everything, just that it’s far more versatile than most liquids we know.

What does it mean that water is amphoteric? I get confused with the idea that it can be an acid and a base at the same time.

Being amphoteric means that water can act as an acid by releasing hydrogen ions or as a base by releasing hydroxide ions, depending on what substance it reacts with, so it’s not that it “changes personality,” but that it can adjust its behavior depending on what’s around it, which explains why it participates in so many chemical reactions.

Why is it so hard to heat water? Sometimes it feels like it takes forever to boil.

Water has a very high heat capacity because its molecules are held together by forces that absorb a lot of energy before the temperature can rise, so when you heat it, much of the energy goes into breaking those interactions before the water actually warms up, which is why it takes longer to boil than many other liquids.