Dilute Acid vs Concentrated Acid — Difference (with Table & FAQs)
Dilute Acid vs Concentrated Acid compared side by side — a 6-row comparison table, 4 key points and 3 exam FAQs. Class 10-11 Chemistry, free and no sign-up.
TL;DR: Dilute Acid vs Concentrated Acid compared side by side — a 6-row comparison table, 4 key points and 3 exam FAQs. Class 10-11 Chemistry, free and no si…
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
The main difference between Dilute Acid and Concentrated Acid: A dilute acid has a low concentration of acid solute dissolved in a larger amount of solvent, usually water. A concentrated acid has a high concentration o
Dilute Acid vs Concentrated Acid — Comparison Table
| Basis | Dilute Acid | Concentrated Acid |
|---|---|---|
| Solute Concentration | Low concentration of acid molecules | High concentration of acid molecules |
| Solvent Amount | More solvent (water) present | Less solvent (water) present |
| Reactivity | Less reactive due to lower concentration | More reactive due to higher concentration |
| Heat Release | Releases less heat during reaction | Releases more heat during reaction |
| pH | Higher pH (less acidic) | Lower pH (more acidic) |
| Example | 2N hydrochloric acid, vinegar | 18N hydrochloric acid, concentrated sulfuric acid |
Key Points
- Dilution decreases the concentration but does not change acid strength
- Concentrated strong acids are more dangerous due to higher reactivity
- Mixing concentrated acid with water must be done carefully
- pH depends on concentration; strong acids have low pH even when dilute
Frequently Asked Questions
What is the difference between a dilute and a concentrated acid?
It is a matter of how much water is present. A concentrated acid contains a large amount of acid and little water; a dilute acid contains a small amount of acid in a large amount of water.
Is a dilute acid the same as a weak acid?
No, and this is the commonest confusion. Dilute and concentrated describe how much acid is dissolved. Strong and weak describe how completely the acid ionises in water. A strong acid can be dilute, and a weak acid can be concentrated.
Why must acid always be added to water, and never water to acid?
Diluting a concentrated acid releases a great deal of heat. Adding acid slowly to a large volume of water lets that heat spread through the water. Adding water to concentrated acid concentrates the heat where the drops land, and the mixture can spit dangerously.