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What is an Aqueous Solution?
Grade Level:
Class 10
AI/ML, Physics, Biotechnology, Space Technology, Chemistry, Engineering, Medicine
Definition
What is it?
An aqueous solution is a solution where water acts as the solvent. This means a substance (solute) is dissolved in water to form a uniform mixture. It's one of the most common types of solutions found in nature and in our daily lives.
Simple Example
Quick Example
Imagine making a glass of Nimbu Pani (lemonade) at home. You take some sugar and salt (solutes) and stir them into water (solvent). The clear, refreshing drink you get is an aqueous solution, as water is doing the dissolving.
Worked Example
Step-by-Step
Problem: You have 20 grams of common salt (NaCl) and want to make an aqueous solution. You add it to 100 ml of water. Is the resulting mixture an aqueous solution once the salt dissolves? --- Step 1: Identify the solute. The solute is the substance being dissolved, which is 20 grams of common salt (NaCl). --- Step 2: Identify the solvent. The solvent is the substance doing the dissolving, which is 100 ml of water. --- Step 3: Check if the solvent is water. In this case, yes, the solvent is water. --- Step 4: Determine the type of solution. Since water is the solvent and the salt dissolves in it, the resulting mixture is indeed an aqueous solution. --- Answer: Yes, the resulting mixture is an aqueous solution.
Why It Matters
Understanding aqueous solutions is crucial in fields like Medicine for making injectables, in Biotechnology for preparing cell cultures, and in Environmental Science for analyzing water pollution. Chemists use this concept daily to develop new materials and understand reactions, impacting everything from drug discovery to battery technology.
Common Mistakes
MISTAKE: Thinking all solutions are aqueous solutions. | CORRECTION: An aqueous solution specifically means water is the solvent. If alcohol or another liquid is the solvent, it's a non-aqueous solution.
MISTAKE: Confusing a suspension or colloid with an aqueous solution. | CORRECTION: In an aqueous solution, the solute particles are completely dissolved and uniformly spread, making it a clear, transparent mixture. Suspensions and colloids have visible or larger particles that might settle or scatter light.
MISTAKE: Believing that 'aqueous' refers to the solute. | CORRECTION: 'Aqueous' always refers to the solvent being water. The solute can be solid, liquid, or gas, as long as it dissolves in water.
Practice Questions
Try It Yourself
QUESTION: Is a solution of sugar in milk an aqueous solution? | ANSWER: No, because milk is not pure water and acts as the solvent here. For an aqueous solution, water must be the solvent.
QUESTION: You dissolve 5 grams of glucose in 50 ml of water. What type of solution do you get? Explain why. | ANSWER: You get an aqueous solution. This is because glucose (solute) is dissolved in water (solvent), and water is the defining component of an aqueous solution.
QUESTION: A chemist prepares two solutions: Solution A has iodine dissolved in alcohol. Solution B has potassium iodide dissolved in water. Which one is an aqueous solution and why? | ANSWER: Solution B is an aqueous solution. This is because in Solution B, water is used as the solvent to dissolve potassium iodide, whereas in Solution A, alcohol is the solvent.
MCQ
Quick Quiz
Which of the following is an example of an aqueous solution?
Sulphur dissolved in carbon disulfide
Salt dissolved in cooking oil
Carbon dioxide dissolved in water (soda water)
Nail polish dissolved in acetone
The Correct Answer Is:
C
An aqueous solution requires water as the solvent. In option C, carbon dioxide gas is dissolved in water, making it an aqueous solution (like soda water). Options A, B, and D use solvents other than water.
Real World Connection
In the Real World
Many everyday items in India are aqueous solutions! The ORS (Oral Rehydration Solution) given to people suffering from dehydration is an aqueous solution of salts and sugar in water. Even the water purification plants in our cities use processes that involve understanding how impurities form aqueous solutions to remove them and provide safe drinking water.
Key Vocabulary
Key Terms
SOLVENT: The substance that dissolves another substance, usually present in a larger amount. | SOLUTE: The substance that gets dissolved in a solvent, usually present in a smaller amount. | SOLUTION: A homogeneous mixture formed when a solute dissolves in a solvent. | HOMOGENEOUS MIXTURE: A mixture where the components are uniformly distributed, and individual components cannot be easily distinguished.
What's Next
What to Learn Next
Great job understanding aqueous solutions! Next, you should explore 'Concentration of Solutions' to learn how to quantify the amount of solute present. This will help you understand how strong or weak a solution is, which is super important in chemistry!
