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What is a Solute (chemistry)?
Grade Level:
Class 7
Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics
Definition
What is it?
A solute is a substance that dissolves in another substance to form a solution. Think of it as the 'thing being dissolved'. It is usually present in a smaller amount than the substance it dissolves into.
Simple Example
Quick Example
Imagine you are making a glass of nimbu pani (lemonade). You take a glass of water and add a spoonful of sugar. In this case, the sugar is the solute because it dissolves in the water. The water is the 'dissolver'.
Worked Example
Step-by-Step
Let's say you are preparing a salt solution for an experiment.
Step 1: You take a beaker and add 100 ml of water.
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Step 2: You then add 5 grams of common salt (sodium chloride) to the water.
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Step 3: You stir the mixture until the salt completely disappears and mixes evenly with the water.
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Step 4: Here, the salt (sodium chloride) is the substance that dissolved in the water.
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Answer: Therefore, the salt is the solute in this salt solution.
Why It Matters
Understanding solutes is crucial in many fields, from creating new medicines in HealthTech to designing efficient batteries for EVs. Chemists and pharmacists use this concept daily to formulate products. It even helps environmental scientists understand how pollutants dissolve in water.
Common Mistakes
MISTAKE: Thinking the solute is always a solid | CORRECTION: Solutes can be solids (like sugar), liquids (like alcohol in water), or even gases (like carbon dioxide in soda).
MISTAKE: Confusing solute with solvent | CORRECTION: The solute is the substance that dissolves, while the solvent is the substance that does the dissolving. The solute is usually in a smaller amount.
MISTAKE: Believing a solute disappears forever | CORRECTION: A solute doesn't disappear; it just spreads out evenly and mixes with the solvent. You can often get it back by evaporating the solvent.
Practice Questions
Try It Yourself
QUESTION: In a cup of chai, when you add sugar, what is the solute? | ANSWER: Sugar
QUESTION: If you mix 10 ml of cooking oil with 100 ml of water, will the oil be a solute? Why or why not? | ANSWER: No, the oil will not be a solute. Oil does not dissolve in water; they form separate layers. For something to be a solute, it must dissolve.
QUESTION: A chemist prepares a mixture by adding 20g of a blue powder to 500ml of a clear liquid. After stirring, the blue powder vanishes and the liquid turns blue. Identify the solute and explain your reasoning. | ANSWER: The blue powder is the solute. It is the substance that dissolved in the clear liquid, causing the liquid to change color and appear uniform.
MCQ
Quick Quiz
Which of the following is the best example of a solute?
Water in a glass
Salt in a glass of water
Oil floating on water
A stone at the bottom of a pond
The Correct Answer Is:
B
Salt in a glass of water is the correct answer because salt dissolves in water, making it the substance being dissolved. Options A, C, and D do not describe a substance dissolving.
Real World Connection
In the Real World
When you buy a fizzy drink like soda or a cold drink, the 'fizz' is actually carbon dioxide gas dissolved in the liquid. Here, carbon dioxide is the solute. This concept is also used in water purification plants to dissolve chemicals that clean water, ensuring we get safe drinking water at home.
Key Vocabulary
Key Terms
SOLUTION: A uniform mixture formed when a solute dissolves in a solvent. | SOLVENT: The substance that dissolves the solute. | DISSOLVE: To mix completely with a liquid and become part of the liquid. | MIXTURE: A substance containing two or more different substances that are not chemically bonded.
What's Next
What to Learn Next
Now that you understand what a solute is, you should learn about 'What is a Solvent?'. This will help you fully grasp the concept of solutions and how different substances interact in chemistry.
