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What is the evidence that a solution is saturated? Postlab Session.

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Presentation on theme: "What is the evidence that a solution is saturated? Postlab Session."— Presentation transcript:

1 What is the evidence that a solution is saturated? Postlab Session

2 Recap What is a solution? What are the properties of solutions? How can particles of a solution pass through the filter paper? Why does a solution have a uniform appearance?

3 Pop Quiz! 1. What is the title of Activity No. 3? 2. Give one objective for the activity. 3. What was the solid solute used in the activity? 4. How much water was placed on the container before the start of the activity? 5. How many times should an experiment be done to be sure of the data gathered?

4 1. What is the title of Activity No. 3? What is the evidence that a solution is saturated?

5 2. Give one objective of the activity. Determine how much solid solute dissolves completely in a given volume of water; Describe the appearance of a saturated solution.

6 3. What was the solid solute used in the activity? sugar

7 4. How much water was placed on the container before the start of the activity? 50 mL

8 5. How many times should an experiment be repeated to be sure of the result of the experiment? At least 3 times

9 Procedures Place 50 mL water in a clear container. Add ¼ teaspoon sugar into the water and dissolve it. Continue adding ¼ teaspoon of sugar until the sugar would not dissolve anymore. Repeat the steps at least 3 times to check whether the results are acceptable or not.

10 Accurate or Precise? Olga is tasked by her groupmates to determine the mass of a 100-gram metal. Upon using the triple beam balance, she got the following measurements after three trials:95.12 grams, grams, and grams. Is the triple beam balance precise or accurate in its measurements?

11 Critical points Accurate – measurements are compared against a reference or accepted value. Precise – refers to how close the measurements to each other.

12 Going back… Olga is tasked by her groupmates to determine the mass of a 100-gram metal. Upon using the triple beam balance, she got the following measurements after three trials:95.12 grams, grams, and grams. Is the triple beam balance precise or accurate in its measurements? Accurate? Precise?

13 Which is more important in experiments? Accuracy of precision?

14 Going back… After calibrating the triple beam balance, Olga measured again the 100-gram metal and got the following measurements: grams, grams, grams. Are the data accurate or precise?

15 Meanwhile… Amount of SugarObservations After adding ¼ teaspoon of sugar The sugar is dissolved completely. ½ teaspoon of sugarThe sugar is dissolved completely. ¾ teaspoon of sugarThe sugar is dissolved completely. 1 teaspoon of sugarThe sugar is dissolved completely. 1 ¼ teaspoon of sugarThe sugar is dissolved completely. 1 ½ teaspoon of sugarThe sugar is dissolved completely. 1 ¾ teaspoon of sugarThe sugar is dissolved completely.

16 After adding more… Amount of SugarObservations 4 teaspoons of sugarThe sugar is dissolved completely. 4 ¼ teaspoons of sugar The sugar is dissolved completely. 4 ½ teaspoons of sugar The sugar is dissolved completely. 4 ¾ teaspoons of sugar The sugar is dissolved completely. 5 teaspoons of sugarThe sugar is dissolved completely. 5 ¼ teaspoons of sugar The sugar is dissolved completely. 5 ½ teaspoons of sugar Sugar doesnt dissolve anymore.

17 Why wouldnt the sugar dissolve in water? There is a MAXIMUM AMOUNT of solute that can dissolve in a given amount of solvent at a given temperature.

18 What is the maximum amount of sugar that can dissolve in 50 mL water at room temperature? Amount of SugarObservations 4 teaspoons of sugarThe sugar is dissolved completely. 4 ¼ teaspoons of sugar The sugar is dissolved completely. 4 ½ teaspoons of sugar The sugar is dissolved completely. 4 ¾ teaspoons of sugar The sugar is dissolved completely. 5 teaspoons of sugarThe sugar is dissolved completely. 5 ¼ teaspoons of sugar The sugar is dissolved completely. 5 ½ teaspoons of sugar Sugar doesnt dissolve anymore.

19 When the solvent contains the MAXIMUM AMOUNT of solute that it can dissolve, it is a called SATURATED SOLUTION.

20 What is a SATURATED SOLUTION? A SATURATED SOLUTION is a solution that contains the MAXIMUM AMOUNT of solute that the solvent can dissolve.

21 How would you know that a solution is saturated? Amount of SugarObservations 4 teaspoons of sugarThe sugar is dissolved completely. 4 ¼ teaspoons of sugar The sugar is dissolved completely. 4 ½ teaspoons of sugar The sugar is dissolved completely. 4 ¾ teaspoons of sugar The sugar is dissolved completely. 5 teaspoons of sugarThe sugar is dissolved completely. 5 ¼ teaspoons of sugar The sugar is dissolved completely. 5 ½ teaspoons of sugar Sugar doesnt dissolve anymore. What happens when you add more solute to a saturated solution?

22 What is the evidence that a solution is saturated? The presence of excess solute which can no longer dissolve is an evidence that a solution is saturated.

23 What is an UNSATURATED SOLUTION? SATURATED SOLUTION

24 A solution is UNSATURATED when it contains LESS SOLUTE than the MAXIMUM AMOUNT it can dissolve in a given temperature.

25 Summing up… A SATURATED SOLUTION is a solution that contains the MAXIMUM AMOUNT of solute that the solvent can dissolve. The presence of excess solute which can no longer dissolve is an evidence that a solution is saturated. A solution is UNSATURATED when it contains LESS SOLUTE than the MAXIMUM AMOUNT it can dissolve in a given temperature.

26 How would you know which of these solutions is SATURATED? 50 grams of salt in 20 mL water 50 grams of sugar in 20 mL water

27 Moving forward… The MAXIMUM AMOUNT of solute that can dissolve in a given volume of solvent at a given temperature is called the SOLUBILITY OF THE SOLUTE.

28 The solubility of salt at 25 0 C is 36 grams in 100 mL of water. The MAXIMUM AMOUNT of solute that can dissolve in a given volume of solvent at a given temperature is called the SOLUBILITY OF THE SOLUTE.

29 Describe the following solutions grams of salt in 100 mL of water grams of salt in 100 mL of water grams of salt in 100 mL of water grams of salt in 200 mL of water grams of salt in 200 mL of water The solubility of salt at 25 0 C is 36 grams in 100 mL of water.

30 Ricky was trying to determine the solubility of salt in 100 mL of water. He did three trials and got the following results: First TrialSecond TrialThird Trial grams36.24 grams36.07 grams Accurate or Precise?

31 A group of students were able to gather the following data and observations after dissolving sugar in 100 mL of water. StepAmount of Solute added Observations 11 teaspoonAfter stirring, sugar dissolves completely. 21 teaspoonAfter stirring, sugar dissolves completely. 31 teaspoonAfter stirring, sugar dissolves completely. 41 teaspoonAfter stirring, sugar dissolves completely. 51 teaspoonAfter stirring, some sugar is seen at the bottom of the container

32 True or False? 1. An unsaturated solution is a solution that contains the maximum amount of solute that can be dissolved. 2. The presence of excess solute that can no longer be dissolved is an evidence that the solution is saturated. 3. The maximum amount of solute that can dissolve in a given volume of solvent at a given temperature is called the solubility of the solvent.

33 Reminders! Please do advance reading of our lessons through your text. Chapter 5 (Solutions) Checking of textbooks on Monday. Ensure that you have your books on that date. Bring a calculator on the next session. It DOESNT have to be a scientific calculator.


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