chemistry

Sodium laureth sulfate

Sodium laureth sulfate is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Sodium laureth sulfate rather than just read about it. In short: Sodium lauryl ether sulfate (SLES), usually contracted as sodium laureth sulfate, and also called sodium alkylethersulfate, is an anionic detergent and surfactant found in many personal care products (soaps, shampoos, toothpaste, etc.) and for industrial uses. SLES is an inexpensive and very effective foaming agent.

Key takeaways

Sodium laureth sulfate belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sodium laureth sulfate to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sodium laureth sulfate from memory before moving on to harder problems.

Reference excerpt

Sodium lauryl ether sulfate (SLES), usually contracted as sodium laureth sulfate, and also called sodium alkylethersulfate, is an anionic detergent and surfactant found in many personal care products (soaps, shampoos, toothpaste, etc.) and for industrial uses. SLES is an inexpensive and very effective foaming agent. SLES, sodium lauryl sulfate (SLS), ammonium lauryl sulfate (ALS), and sodium pareth sulfate are surfactants that are used in many cosmetic products for their cleaning and emulsifying properties. It is derived from palm kernel oil or coconut oil. In herbicides, it is used as a surfactant to improve absorption of the herbicidal chemicals and reduces time the product takes to be rainfast, when enough of the herbicidal agent will be absorbed. The chemical formula for this family of surfactants is CH3(CH2)11(OCH2CH2)nOSO3Na. Sometimes the number represented by n is specified in the name, for example laureth-2 sulfate. The product is however heterogeneous in that the number of ethoxyl groups, where n is the mean. Laureth-3 sulfate is the most common one in commercial products. Compared to the parent sodium lauryl sulfate (CH3(CH2)11OSO3Na), SLES is more surface-active owing to the presence of the ethoxy groups.

Production SLES is prepared by ethoxylation of dodecyl alcohol, which is produced industrially from palm kernel oil or coconut oil. The resulting ethoxylate is converted to a half ester of sulfuric acid, which is neutralized by conversion to the sodium salt. The related surfactant sodium lauryl sulfate or SLS (also known as sodium dodecyl sulfate or SDS) is produced similarly, but without the ethoxylation step. SLS and ammonium lauryl sulfate (ALS) are commonly used alternatives to SLES in consumer products.

Environmental impacts SLES is toxic to aquatic animals. Low concentrations can cause severe effects and even death in fish.

Safety SLES does not induce any adverse responses in any toxicology testing. SLES is a skin and eye irritant but not a sensitizer. SLES may retain trace amounts of the probable human carcinogen 1,4-dioxane, an unintended chemical by-product formed during the ethoxylation and subsequent sulfonation steps used to synthesize it. Since the presence of 1,4-dioxane was recognized, many manufacturers have implemented purification processes, such as vacuum and steam stripping, to reduce its concentration in finished products.

See also Sodium lauroyl sarcosinate Sodium dodecyl sulfate Sodium myreth sulfate Sodium pareth sulfate Magnesium laureth sulfate Sodium dodecylbenzenesulfonate

References

External links Sodium laureth sulfate in the Consumer Product Information Database

Worked examples

Example 1 — a first encounter with Sodium laureth sulfate

Start with the simplest possible case. Write down what Sodium laureth sulfate claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Sodium laureth sulfate before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Sodium laureth sulfate ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Sodium laureth sulfate

In research: Sodium laureth sulfate appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Sodium laureth sulfate in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Sodium laureth sulfate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anionic surfactants, Cosmetics chemicals, Dodecyl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Sodium laureth sulfate outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Sodium laureth sulfate in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sodium laureth sulfate means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Sodium laureth sulfate out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sodium laureth sulfate in simple terms?

Why does Sodium laureth sulfate matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Sodium laureth sulfate?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Sodium laureth sulfate.