Is hydrogen sulphite the same as hydrogen sulfide?

No, they are completely different. Hydrogen sulphite (HSO₃⁻) is a salt/ion. Hydrogen sulfide (H₂S) is a toxic, foul-smelling gas.

What is the difference between sulphite and hydrogen sulphite?

Sulphite is SO₃²⁻. Hydrogen sulphite (or bisulphite) is HSO₃⁻, where a hydrogen ion is attached to the sulphite ion.

How is hydrogen sulphite used?

It is used as a preservative (E222 in food), a reducing agent in chemical processes, and in some analytical chemistry tests.

Is 'bisulphite' a synonym for hydrogen sulphite?

Yes, in most chemical contexts, 'bisulphite' (or 'bisulfite' in US spelling) refers to the same HSO₃⁻ ion or its salts.

hydrogen sulphite

Low

UK/ˈhaɪdrədʒən ˈsʌlfaɪt/US/ˈhaɪdrədʒən ˈsʌlfaɪt/

Technical/Scientific

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Definition

Meaning

A salt or ester of sulphurous acid containing the anion HSO₃⁻.

In chemistry, a compound where hydrogen is combined with sulphite ions, often used as a preservative, antioxidant, or reducing agent in industrial processes.

Linguistics

Semantic Notes

Specifically refers to the HSO₃⁻ ion or its salts. Often confused with 'sulphite' (SO₃²⁻) or 'hydrosulphite' (S₂O₄²⁻). Its use is almost exclusively in chemistry and related technical fields.

Dialectal Variation

British vs American Usage

Differences

Spelling: British English uses 'sulphite', American English uses 'sulfite'.

Connotations

Identical technical meaning. No difference in connotation.

Frequency

Equally low frequency in both varieties; used only in technical contexts.

Vocabulary

Collocations

strong

sodium hydrogen sulphiteammonium hydrogen sulphitehydrogen sulphite ion

medium

solution of hydrogen sulphiteaddition of hydrogen sulphite

weak

hydrogen sulphite compoundshydrogen sulphite salts

Grammar

Valency Patterns

[substance] is treated with hydrogen sulphite.Hydrogen sulphite acts as a [function].

Vocabulary

Synonyms

Neutral

bisulphite (bisulfite)

Weak

sulphurous acid salt (in specific contexts)

Usage

Context Usage

Business

Rare, only in chemical manufacturing or food additive supply.

Academic

Used in chemistry textbooks and research papers on inorganic or analytical chemistry.

Everyday

Virtually never used.

Technical

Primary domain of use. Found in laboratory procedures, industrial chemistry, and food science (as a preservative E222).

Examples

By Part of Speech

adjective

British English

The hydrogen sulphite solution was prepared fresh.
A hydrogen sulphite preservative is listed.

American English

The hydrogen sulfite solution was prepared fresh.
A hydrogen sulfite preservative is listed.

Examples

By CEFR Level

Sodium hydrogen sulphite is sometimes used in winemaking.
The test for aldehydes can involve hydrogen sulphite.

The nucleophilic addition of the hydrogen sulphite ion to the carbonyl group is a classic analytical test.
In the bleaching process, hydrogen sulphite salts act as reducing agents.

Learning

Memory Aids

Mnemonic

Think: HYDROGEN + SULPHITE. 'Hydro' reminds you of water/H, and 'sulphite' is the sulfur-based ion (SO₃).

Conceptual Metaphor

A chemical 'partner' or 'modifier' (hydrogen modifies the sulphite ion).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

Do not confuse with 'сероводород' (hydrogen sulphide/H₂S).
Do not confuse with 'сульфит' (sulphite/SO₃²⁻) – hydrogen sulphite is the bisulphite form.
The English 'hydrogen sulphite' corresponds most accurately to 'гидросульфит' or 'бисульфит' in Russian.

Common Mistakes

Misspelling as 'hydrogen sulfide' (a toxic gas).
Using 'sulphite' and 'sulfate' interchangeably.
Pronouncing 'sulphite' with a long 'i' (/saɪt/) as in 'light'; correct is /faɪt/.

Practice

Quiz

Fill in the gap

In the lab, we added sodium to the solution to test for the presence of an aldehyde.

Multiple Choice

What is the primary use of hydrogen sulphite in the food industry?

FAQ

Frequently Asked Questions

: No, they are completely different. Hydrogen sulphite (HSO₃⁻) is a salt/ion. Hydrogen sulfide (H₂S) is a toxic, foul-smelling gas.
: Sulphite is SO₃²⁻. Hydrogen sulphite (or bisulphite) is HSO₃⁻, where a hydrogen ion is attached to the sulphite ion.
: It is used as a preservative (E222 in food), a reducing agent in chemical processes, and in some analytical chemistry tests.
: Yes, in most chemical contexts, 'bisulphite' (or 'bisulfite' in US spelling) refers to the same HSO₃⁻ ion or its salts.