Concentration of a Solution
Concentration tells how much solute is present in a given amount of solution or solvent.
Practice This ConceptMain explanation
Teacher explanation
A concentrated solution has comparatively more solute, while a dilute solution has comparatively less solute. In Class 9 numerical questions, concentration is commonly expressed as mass percentage or volume percentage.
Example
If 10 g salt is dissolved to make 100 g solution, the mass percent of salt is 10%.
Simple analogy
Percent concentration means part out of whole solution.
Common confusion
Students often divide by mass of solvent instead of mass of solution in mass percent questions.
Exam tip
Underline whether the question asks mass by mass percent or volume by volume percent before substituting values.
Answer writing and exam use
1-mark use
Write the exact meaning of concentration of a solution in one clean line.
2-mark use
Define concentration of a solution and add one example or condition.
3-mark use
Explain concentration of a solution, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
Open the concept quiz intro first, review the test details, and then start a focused MCQ set from this concept only. Instant score and answer review are live now.
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