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What is a Sulphate (SO4^2- ion compound)?
Grade Level:
Class 7
Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics
Definition
What is it?
A sulphate is a chemical compound that contains the sulphate ion (SO4^2-). This ion is made up of one sulphur atom bonded to four oxygen atoms, and it carries a negative charge of 2-.
Simple Example
Quick Example
Imagine a school bus (the sulphate ion) that always carries 4 students (oxygen atoms) and 1 driver (sulphur atom). This bus also needs 2 tickets to enter the parking lot (representing its 2- charge). Any compound that includes this specific 'bus' is called a sulphate compound.
Worked Example
Step-by-Step
Let's identify sulphates in common names:
1. Look for the word 'sulphate' in the chemical name.
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2. For example, 'Copper Sulphate' clearly contains the sulphate ion.
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3. 'Sodium Chloride' does not contain 'sulphate'.
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4. 'Magnesium Sulphate' contains the sulphate ion.
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5. 'Calcium Carbonate' does not contain 'sulphate'.
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Answer: Copper Sulphate and Magnesium Sulphate are compounds containing the sulphate ion.
Why It Matters
Sulphates are important in many areas, from everyday products to advanced technology. They are used in medicines, fertilisers to help plants grow, and even in some batteries for electric vehicles (EVs). Understanding sulphates can open doors to careers in chemistry, environmental science, and materials engineering.
Common Mistakes
MISTAKE: Confusing sulphate (SO4^2-) with sulphite (SO3^2-) or sulphide (S^2-). | CORRECTION: Remember 'sulphate' has four oxygen atoms (SO4), 'sulphite' has three oxygen atoms (SO3), and 'sulphide' is just sulphur (S) with a 2- charge.
MISTAKE: Thinking that 'sulphur' and 'sulphate' are the same thing. | CORRECTION: Sulphur is an element (S), while sulphate is a compound ion (SO4^2-) formed when sulphur combines with oxygen.
MISTAKE: Forgetting the 2- charge on the sulphate ion. | CORRECTION: Always remember the sulphate ion (SO4) has a negative 2 charge (2-), which is crucial for forming neutral compounds.
Practice Questions
Try It Yourself
QUESTION: Which of these is a sulphate compound: Zinc Sulphate or Potassium Chloride? | ANSWER: Zinc Sulphate
QUESTION: How many oxygen atoms are present in one sulphate ion? | ANSWER: Four (4) oxygen atoms
QUESTION: If a compound is called 'Iron (II) Sulphate', what is the chemical formula of the ion that gives it the 'sulphate' part? | ANSWER: SO4^2-
MCQ
Quick Quiz
What is the chemical formula of the sulphate ion?
SO3^2-
S^2-
SO4^2-
Sulphur
The Correct Answer Is:
C
The sulphate ion is correctly represented by SO4^2-, indicating one sulphur atom, four oxygen atoms, and a 2- charge. Options A and B are sulphite and sulphide ions, respectively, and D is the element sulphur.
Real World Connection
In the Real World
In India, sulphates are commonly found in the fertilisers farmers use to boost crop yield, like Ammonium Sulphate. They are also present in some common medicines, such as Magnesium Sulphate, which can be used as a laxative. Even the water we drink might contain traces of sulphates, and water treatment plants need to monitor their levels.
Key Vocabulary
Key Terms
ION: An atom or molecule that has gained or lost one or more electrons, giving it an electrical charge. | COMPOUND: A substance formed when two or more chemical elements are chemically bonded together. | ATOM: The basic unit of matter, consisting of a dense nucleus surrounded by a cloud of negatively charged electrons. | CHARGE: An electrical property of matter that can be positive or negative.
What's Next
What to Learn Next
Now that you understand what a sulphate is, you can explore other common ions like carbonates and nitrates. This will help you understand how different ions combine to form various chemical compounds, which is key to learning about chemical reactions!
