chemistry

Thallium(I) sulfate

Thallium(I) 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 Thallium(I) sulfate rather than just read about it. In short: Thallium(I) sulfate (Tl2SO4) or thallous sulfate is the sulfate salt of thallium in the common +1 oxidation state, as indicated by the Roman numeral I. It is often referred to as simply thallium sulfate.

Key takeaways

Thallium(I) 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 Thallium(I) sulfate to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Thallium(I) sulfate from memory before moving on to harder problems.

Reference excerpt

Thallium(I) sulfate (Tl2SO4) or thallous sulfate is the sulfate salt of thallium in the common +1 oxidation state, as indicated by the Roman numeral I. It is often referred to as simply thallium sulfate.

Uses During the last two centuries, Tl2SO4 had been used for various medical treatments but was abandoned. In the later 1900s it found use mainly for rodenticides. These applications were prohibited in 1975 in the US due to the nonselective nature of its toxicity. Thallium(I) sulfate inhibits the growth of plants by preventing germination. Tl2SO4 is mostly used today as a source of Tl+ in the research laboratory. It is a precursor to thallium(I) sulfide (Tl2S), which exhibits high electrical conductivity when exposed to infrared light.

Preparation Thallium(I) sulfate is produced by the reaction of thallium metal with sulfuric acid followed by crystallization.

Structure Tl2SO4 adopts the same structure as K2SO4. In aqueous solution, the thallium(I) cations and the sulfate anions are separated and highly solvated. Thallium(I) sulfate crystals have a C2 symmetry.

Toxicity Thallium(I) sulfate is soluble in water and its toxic effects are derived from the thallium(I) cation. The mean lethal dose of thallium(I) sulfate for an adult is about 1 gram. Since thallium(I) sulfate is a simple powder with indistinctive properties, it can easily be mistaken for more innocuous chemicals. It can enter the body by ingestion, inhalation, or through contact with the skin. The thallium(I) cation is very similar to potassium and sodium cations, which are essential for life. After the thallium ion enters the cell, many of the processes that transport potassium and sodium are disrupted. Due to its poisonous nature, many western countries have banned the use of thallium(I) sulfate in products for home use and many companies have also stopped using this compound. A dosage in excess of 500 mg is reported as fatal. Thallium(I) sulfate, after entering the body, concentrates itself in the kidneys, liver, brain, and other tissues in the body. Thallium(I) sulfate was used in 1950s Israel to control the rodent population; it is suspected that this resulted in the disappearance of the brown fish owl.

Sources Saha A. Thallium toxicity: A growing concern. Indian J Occup Environ Med 2005;9:53-56

References

External links International Chemical Safety Card 0336 NIOSH Pocket Guide to Chemical Hazards Pesticide Data Sheet Archived 2008-02-24 at the Wayback Machine (WHO/FAO) Kaunas University of Technology University of Wisconsin-Madison Chemistry Department Smithsonian National Zoological Park Archived 2008-03-03 at the Wayback Machine ISIS Conducting Chemical Weapons Tests on Live Victims

Illustrations

Worked examples

Example 1 — a first encounter with Thallium(I) sulfate

Start with the simplest possible case. Write down what Thallium(I) 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 Thallium(I) 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 Thallium(I) 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 Thallium(I) sulfate

In research: Thallium(I) 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 Thallium(I) 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: Thallium(I) sulfate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Rodenticides, Sulfates, Thallium(I) compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Thallium(I) 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 Thallium(I) sulfate in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Thallium(I) 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 Thallium(I) sulfate out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Thallium(I) sulfate in simple terms?

Why does Thallium(I) 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 Thallium(I) 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 Thallium(I) sulfate.