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Difference Between Acid and Alkaline

In this article, learn the difference between acid and alkaline. So, in the world of chemistry, there is a lot of talk about acids and alkalis. Acid and alkaline (also referred to as base) are two opposite ends of the pH (potential of hydrogen) scale, which measures the acidity or alkalinity of a substance.

Both are substances that are used in different areas, such as medicine, the food industry, and agriculture, among others. However, it is important to know the differences between the two to know how they work and which is the best option for each situation.

Differences Between Acid And Alkaline

Here are the key differences between acids and alkaline substances:

Difference Between Acid And Alkaline Comparison Chart

Acid Alkaline
An acid is a chemical species that donates a proton. An alkaline is any substance that accepts a proton.
Lower than pH 7 Higher than pH 7
Rest on the concentration of hydronium ions. Depends on the concentration of hydroxide ions
Ions present
Composed of H+ ions Composed of OH- ions.
bitter taste Bitter in taste
Clingy Slippery
Neutralized by bases Neutralized by acids
remains colorless change to pink
Sulfuric acid, hydrochloric acid and acetic acid, etc. Sodium hydroxide, potassium hydroxide and magnesium hydroxide.

What is acid?

An acid is a substance that has a pH less than 7. This means that it is a substance that has a greater amount of hydrogen ions (H+) in its composition. Acids can be very corrosive and dangerous to health in high concentrations. For example, sulfuric acid is a very strong acid that can cause skin burns.

Acid Examples:

  • Hydrochloric acid
  • Sulfuric acid
  • Acetic Acid
  • Citric acid

What is Alkaline?

Unlike acids, a substance is alkaline when its pH is greater than 7. This indicates that it has a greater amount of hydroxyl ions (OH-) in the composition. Alkaline substances are known for their alkalizing and disinfecting properties. Most often, they are used to clean surfaces and eliminate bacteria.

Examples of alkali

  • Sodium hydroxide (caustic soda)
  • Baking soda (baking soda)
  • Potassium hydroxide
  • Calcium hydroxide (lime)

What are the basic Differences between acid and alkaline?

As we know that, the main difference between acidic and alkaline is the pH as we discussed above. While acids have a pH less than 7, alkalines have a pH greater than 7. In addition, acids are corrosive and hazardous to health at high concentrations, while alkalines are known for their disinfecting and alkalizing properties.


In conclusion, it is important to know the differences between acid and alkaline in order to use them properly and safely. Knowing when to use one or the other can make a difference in different situations in everyday life, such as home cleaning, agriculture, and the food industry.

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