SCIENCE7: Concentrations of a Solution
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The document outlines the objectives and concepts related to the concentration of solutions, including definitions of solute, solvent, and various types of solutions (concentrated, diluted, saturated, unsaturated, and supersaturated). It provides formulas for calculating percent by mass and percent by volume, along with sample problems to illustrate these calculations. Additionally, it includes instructions for practical activities and assessments to deepen understanding of the topic.
SCIENCE7: Concentrations of a Solution
- 1. 11/27/2020 1 SCIENCE 7Concentration of Solutions
- 2. MELC : Expresses concentrations of solutions quantitatively by preparing different concentrations of mixtures according to uses and availability of materials. Quarter : 1 Week : 6 Objectives: A. Defines concentration of a solution; B. Distinguishes concentrated solution from diluted solution; and C. Shows willingness to answer a given problem using the correct formula in finding the percentage concentration of a solution.
- 3. Let’s have a recap… What is a solution? A homogenous mixture of two or more substances. A mixture of solvent & solute. How are you going to define a solute and a solvent? A solvent is a substance that dissolves the solute. A solute is a substance dissolved in a solvent. What is the solute in the given solution? • Orange Powder How about the solvent? • Water A mixture of orange powder (solute ) and water (solvent ) forms an orange juice (solution).
- 4. A B C Which of the picture shows a saturated solution and unsaturated solution? Saturated – B Unsaturated – A How about supersaturated solution? Picture C How are you going to describe a solution that is unsaturated? It contains less than the maximum amount of solute. What is a saturated solution? It contains the maximum amount of solute dissolved by a given amount of solvent. When can a solution become supersaturated? It holds more solute than it normally could in its saturated form. It involves heating. Let’s have a recap…
- 5. Let’s start! QUESTIONS: 1. How will you describe the pictures above? 2. Which of the following solution is concentrated? 3. How are you going to describe the concentration of a solution? 4. Is there a way to express the concentration of a solution?
- 6. Diluted Solution contains small amount of solute. Percent by Mass is a ratio of a measured amount of solute to a measured amount of solution. Terms to remember… Percent by Volume is a ratio of the volume of solute to the total amount of volume the solution. Concentration is a ratio comparing the amount of solute to the amount of solution. Concentrated Solution contains large amount of solute.
- 7. Concentrations of Solutions measures of how much solute is dissolved in a specific amount of solvent We describe a solution as concentrated and diluted. Concentrated Solution contains large amount of solute Diluted Solution contains small amount of solute
- 9. Ways of expressing concentration: % % Volume of solution is in mL Mass of solute is in g Mass of Solution = Mass of Solute + Mass of Solvent Volume of Solution= Volume of Solute + Volume of Solvent
- 10. Sample Problem: 1. What is the percent by mass of NaHCO3 in a solution containing 20g NaHCO3 dissolved in 600 g of water? Given: mass of solute = 20 g of NaHCO3 mass of solvent = 600 g of water Required: Percent by mass= ? Formula: Percent by mass = Mass of solute Mass of solution X 100 % Percent by mass = 600 g + 20 g X 100 % 20 g________________ = 3.23 % 620 g X 100 %________________ 20 g =
- 11. Sample Problem: 2.What is the percent by volume of ethanol in a solution that contains 45 mL of ethanol dissolved in 125 mL of water ? Given: volume of solute = 45 mL of ethanol volume of solvent =125 mL of water Required: Percent by volume= ? Formula: Percent by Volume=Volume of solute Volume of solution X 100 % Percent by Volume= 125 mL+ 45 mL X 100 % 45 mL = 26.47 % __________________ 170 mL X 100 %____________45 mL =
- 12. 1. Calculate the percent by mass of 4.35 g of NaCl dissolved in 105 g of water. Percent by mass= Mass of solute Mass of solution X 100 % Percent by mass= 105 g + 4.35 g X 100 % 4.35 g ________________ = 3.98 % 109.35 g X 100 %4.35 g ________________ = Given: mass of solute = 4.35 g of NaCl mass of solvent = 105 g of water Required: Percent by mass =? Formula: Let’s wrap it up…
- 13. 2. What is the percent by volume of isopropyl alcohol in a solution that contains 50 mL of isopropyl alcohol in 2.2 mL of water? Percent by volume= Volume of solute Volume of solution X 100 % Percent by volume= 50 mL + 2.2 mL X 100 % 50 mL________________ = 95.79 % 52.2 mL X 100 % 50 mL = ________________ Given: volume of solute = 50 mL of isopropyl alcohol volume of solvent = 2.2 mL of water Required: Percent by volume =? Formula: Let’s wrap it up…
- 14. I. Solve the following problems below. Show your solutions for 10 points each. Let’s solve this… For online, submit your answer on Friday, October 16, 2020 @ 02:00 PM to Google Classroom. For modular, write your answer on a short bondpaper and submit your answer on Tuesday, October 20, 2020 @ 08:00 – 04:00 PM here in school. 1. What is the percent by volume of hydrochloric acid in a solution that contains 75 mL of hydrochloric solution in 4.2 mL of water? 2. Calculate the percent by mass of 7.05 g of calcium fluoride (CaF) dissolved in 90 g of water. 3. What is the percent by volume of ethanol in a solution that contains 50 mL of ethanol dissolved in 100 mL of water ?
- 15. ONLINE For online, submit your answer on Friday, October 16, 2020 @ 02:00 PM to Google Classroom. Attached the recorded video of the performed activity. Let’s deepen more… For modular, write your illustration and observation on a short bondpaper and submit your answer on Tuesday, October 20, 2020 @ 08:00 – 04:00 PM here in school. ACTIVITY # 4: LET’S MIX IT UP… TASK: In a 2-minute video, perform an experiment showing the difference between concentrated solution from diluted solution. Specify its importance. ACTIVITY #4: LET’S MIX IT UP… TASK: In a Home Task Activity, perform an experiment showing the difference between concentrated solution from diluted solution. Illustrate each sample and indicate each solution. Specify its importance. MODULAR:
- 16. October 12, 2020 LET’S STUDY IN ADVANCE… Let’s bring it home… For online, please be ready for our Oral Examination next meeting via Google Meet with your respective meeting code. Sir Christian A. Ursabia ONLINE/MODULAR: For blended and modular, please be ready for our Oral Examination on October 15, 2020 (02:30 – 04:00 PM) via Phone Call or Messenger if available for blended.