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Is Matter Around Us Pure — Question 3

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Question 3

To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.

Answer

Given,

Mass of solute (NaCl) = 36 g

Mass of solvent (H2O) = 100 g

Mass of solution (NaCl + H2O) = 100 + 36 = 136 g

Concentration = Mass of soluteMass of solution\dfrac{\text{Mass of solute}}{\text{Mass of solution}} x 100

Concentration = 36136\dfrac{36}{136} x 100 = 26.47%

Hence, the concentration of the solution is 26.47%

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Science | Chapter 2: Is Matter Around Us PureWeb Content — Quick Reference

Chapter 2: Is Matter Around Us Pure — Quick Reference

mixtures solutions colloids suspensions separation techniques elements compounds Tyndall effect

Quick Revision Points

  • Pure substances: fixed composition (elements + compounds). Mixtures: variable composition
  • Solution (< 1 nm, transparent), Colloid (1-100 nm, Tyndall effect), Suspension (> 100 nm, settles)
  • Concentration = (mass of solute / mass of solution) × 100
  • Separation: evaporation, centrifugation, chromatography, distillation, sublimation, crystallisation, separating funnel
  • Elements: metals, non-metals, metalloids. Compounds: fixed ratio, chemical separation
  • Tyndall effect: scattering of light by colloidal particles (milk, fog, smoke)
Exam Tips for Chapter 2
  • Read the detailed chapter notes for complete coverage of all NCERT topics.
  • Practice all NCERT in-text and back exercise questions — they are frequently asked in exams.
  • Focus on comparison tables, diagrams, and definitions — these are high-scoring areas.
  • For numericals (if applicable), practice at least 20 problems of varying difficulty.
  • Refer to the practice question bank (200+ questions) for thorough preparation.
Related Resources
  • Detailed Notes: ch02-is-matter-around-us-pure.html
  • Practice Questions: 100+ questions with answers in 05-practice-questions/
  • Chapter Test: 30-mark test paper in 06-tests/chapter-tests-30marks/
  • Formula Sheet: Complete formula reference in 03-teacher-aid/formula-sheet.html
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