Difference Wiki

Calcium Oxide vs. Calcium Hydroxide: What's the Difference?

Edited by Huma Saeed || By Sumera Saeed || Published on January 7, 2024
Calcium oxide (CaO), also known as quicklime, is a white, caustic, alkaline substance. Calcium hydroxide (Ca(OH)₂), also known as slaked lime, is formed by adding water to calcium oxide.

Key Differences

Calcium oxide is produced by heating limestone (calcium carbonate) in a kiln. Calcium hydroxide is created when calcium oxide reacts with water.
Sumera Saeed
Jan 07, 2024
In terms of appearance, calcium oxide is a white to grayish powder. Calcium hydroxide is also a white powder, but it is more crystalline and less caustic.
Sumera Saeed
Jan 07, 2024
Calcium oxide is widely used in the construction industry, particularly in cement making. Calcium hydroxide has diverse applications, including in water treatment and as a pH modifier.
Huma Saeed
Jan 07, 2024
The chemical nature of calcium oxide makes it highly reactive with water, releasing significant heat. In contrast, calcium hydroxide is relatively stable and less reactive.
Sumera Saeed
Jan 07, 2024
Calcium oxide can be hazardous due to its strong alkalinity and corrosiveness. Calcium hydroxide, while still caustic, is generally safer to handle.
Sumera Saeed
Jan 07, 2024
ADVERTISEMENT

Comparison Chart

Common Name

Quicklime
Slaked Lime
Sumera Saeed
Jan 07, 2024

Formation

Heating calcium carbonate
Adding water to calcium oxide
Huma Saeed
Jan 07, 2024

Appearance

White to grayish powder
White, crystalline powder
Sumera Saeed
Jan 07, 2024

Uses

In cement and construction
Water treatment, pH modification
Sumera Saeed
Jan 07, 2024

Reactivity

Highly reactive with water
Less reactive, more stable
Sumera Saeed
Jan 07, 2024
ADVERTISEMENT

Calcium Oxide and Calcium Hydroxide Definitions

Calcium Oxide

Reacts vigorously with water.
Adding water to calcium oxide creates heat and light.
Sumera Saeed
Dec 19, 2023

Calcium Hydroxide

Used in water treatment processes.
Calcium hydroxide adjusts the pH of water.
Sumera Saeed
Dec 19, 2023

Calcium Oxide

A key ingredient in construction materials.
Calcium oxide is integral to manufacturing bricks.
Aimie Carlson
Dec 19, 2023

Calcium Hydroxide

Applied in food and agriculture.
Calcium hydroxide is used in corn processing for tortillas.
Sumera Saeed
Dec 19, 2023

Calcium Oxide

Produced by heating limestone.
The kiln processed limestone into calcium oxide.
Sumera Saeed
Dec 19, 2023

Calcium Hydroxide

Formed by adding water to calcium oxide.
Slaked lime is another name for calcium hydroxide.
Sumera Saeed
Dec 19, 2023

Calcium Oxide

Used in environmental applications.
Calcium oxide is utilized to treat acidic soil.
Sumera Saeed
Dec 19, 2023

Calcium Hydroxide

A component in some dental materials.
Calcium hydroxide is used in root canal treatments.
Sumera Saeed
Dec 19, 2023

Calcium Oxide

A white, alkaline, caustic substance.
Calcium oxide is used to make cement.
Sumera Saeed
Dec 19, 2023

Calcium Hydroxide

Less reactive than calcium oxide.
Calcium hydroxide is safer to handle than quicklime.
Huma Saeed
Dec 19, 2023

FAQs

Is calcium oxide hazardous?

Yes, it's caustic and can cause burns.
Huma Saeed
Jan 07, 2024

Does calcium oxide react with water?

Yes, it reacts vigorously.
Aimie Carlson
Jan 07, 2024

What is the primary use of calcium oxide?

In cement and construction materials.
Sumera Saeed
Jan 07, 2024

How is calcium hydroxide formed?

By adding water to calcium oxide.
Janet White
Jan 07, 2024

Can calcium oxide be found naturally?

Rarely, it's mostly produced industrially.
Sumera Saeed
Jan 07, 2024

How is calcium oxide made?

By heating limestone (calcium carbonate).
Janet White
Jan 07, 2024

What is calcium hydroxide used for?

In water treatment and as a pH modifier.
Janet White
Jan 07, 2024

Can calcium oxide purify water?

Indirectly, it's used to make calcium hydroxide for water treatment.
Sumera Saeed
Jan 07, 2024

Can calcium hydroxide be used in food?

Yes, in processes like corn nixtamalization.
Janet White
Jan 07, 2024

Does calcium hydroxide have agricultural uses?

Yes, in soil treatment and pH control.
Sumera Saeed
Jan 07, 2024

How is calcium oxide stored?

In airtight containers to prevent reaction with moisture.
Aimie Carlson
Jan 07, 2024

Is calcium hydroxide less caustic than calcium oxide?

Yes, it's safer to handle.
Sumera Saeed
Jan 07, 2024

Is calcium oxide soluble in water?

No, it reacts to form calcium hydroxide.
Janet White
Jan 07, 2024

Is calcium hydroxide environmentally friendly?

Generally, but excessive use can alter soil and water pH.
Janet White
Jan 07, 2024

Can calcium hydroxide be used in construction?

Yes, in mortars and plasters.
Sumera Saeed
Jan 07, 2024

What precautions are needed for handling calcium oxide?

Protective gear due to its corrosive nature.
Aimie Carlson
Jan 07, 2024

Is calcium hydroxide a strong base?

Yes, it's a moderately strong base.
Aimie Carlson
Jan 07, 2024

Is calcium hydroxide safe for dental use?

Yes, in specific dental treatments.
Aimie Carlson
Jan 07, 2024

Are there health risks with calcium hydroxide?

It can be irritating to skin and eyes.
Sumera Saeed
Jan 07, 2024

Can calcium oxide be used in food?

Not directly; it's too caustic.
Janet White
Jan 07, 2024
About Author
Written by
Sumera Saeed
Sumera is an experienced content writer and editor with a niche in comparative analysis. At Diffeence Wiki, she crafts clear and unbiased comparisons to guide readers in making informed decisions. With a dedication to thorough research and quality, Sumera's work stands out in the digital realm. Off the clock, she enjoys reading and exploring diverse cultures.
Edited by
Huma Saeed
Huma is a renowned researcher acclaimed for her innovative work in Difference Wiki. Her dedication has led to key breakthroughs, establishing her prominence in academia. Her contributions continually inspire and guide her field.

Trending Comparisons

Popular Comparisons

New Comparisons