ph and Color Change - Activity Sheet
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1 Name Date Period Page ph and Color Change - Activity Sheet Objective: 1. To be able to explain, on the molecular level, that is a measure of the in water and that adding an or a to water affects the concentration of these. DEMONSTRATION Your teacher poured green universal indicator into each of two cups. What does the change in color of the indicator solution tell you about the substance your teacher placed in each cup? PREPARRE FOR THE ACTIVITY 2 clear plastic cups 3 droppers Universal indicator Water Graduated cylinder Sodium carbonate Citric acid 2 flat toothpicks Label your equipment 1. Use masking tape and a pen to label one cup citric acid solution and another cup sodium carbonate solution. 2. Use a small piece of masking tape and a pen to label one dropper citric acid solution and the other dropper sodium carbonate solution.
2 Make a citric acid solution 3. Use the graduated cylinder to add 5 ml of water to the cup labeled citric acid. 4. Use a flat toothpick to pick up as much citric acid as you can on the end of the toothpick as shown. 5. Add this citric acid to the water in the citric acid cup. Gently swirl until the citric acid dissolves. Make a sodium carbonate solution 6. Use the graduated cylinder to add 5 ml of water to the cup labeled sodium carbonate. 7. Use a flat toothpick to pick up as much sodium carbonate as you can on the end of the toothpick as shown. 8. Add this citric acid to the water in the sodium carbonate cup. Gently swirl until the sodium carbonate dissolves. ACTIVITY Question to investigate How does the concentration of citric acid affect the color of universal indicator solution? Universal indicator solution ph color chart Citric acid solution At least 6 toothpicks Spot plate 2 droppers Test your citric acid solution 1. Use one of your droppers to nearly fill 6 small wells in your first spot plate with universal indicator solution. Place the Universal Indicator ph Color Chart in front of the spot plate.
3 2. Use your dropper to add 1 drop of citric acid solution to the second well. Gently mix the liquid with a clean toothpick. 3. Compare the color of the liquid to the control and to the Universal Indicator ph Color Chart. Record the color of the indicator, the number of toothpicks of citric acid, and the ph number in the chart for well 2. Test a more concentrated citric acid solution 4. Add another toothpick scoop of citric acid to the citric acid cup. Gently swirl until the citric acid dissolves. 5. Add 1 drop of this more concentrated citric acid solution to the third well. Gently mix the solution with a clean toothpick. 6. Compare the color of the solution to the control and to the Universal Indicator ph Color Chart. Record the color of the indicator, the number of toothpick scoops of citric acid added, and the ph number in the chart for well Continue adding toothpicks of citric acid and testing the solution in the last three wells to see how many different colors you can get.
4 2. How does the color of the indicator solution change as the citric acid solution becomes more concentrated? 3. How does the number on the ph scale change as the concentration of citric acid solution increases? Question to investigate How does the concentration of sodium carbonate affect the color of universal indicator solution? Universal indicator solution ph color chart Sodium carbonate solution At least 6 toothpicks Spot plate 2 droppers Test your sodium carbonate solution 1. Use one of your droppers to nearly fill 6 small wells in your first spot plate with universal indicator solution. Place the Universal Indicator ph Color Chart in front of the spot plate. 2. Use your dropper to add 1 drop of sodium carbonate solution to the second well. Gently mix the liquid with a clean toothpick. 3. Compare the color of the liquid to the control and to the Universal Indicator ph Color Chart. Record the color of the indicator, the number of toothpicks of sodium carbonate, and the ph number in the chart for well 2.
5 Test a more concentrated sodium carbonate solution 4. Add another toothpick scoop of citric acid to the sodium carbonate cup. Gently swirl until the sodium carbonate dissolves. 5. Add 1 drop of this more concentrated sodium carbonate solution to the third well. Gently mix the solution with a clean toothpick. 6. Compare the color of the solution to the control and to the Universal Indicator ph Color Chart. Record the color of the indicator, the number of toothpick scoops of sodium carbonate added, and the ph number in the chart for well Continue adding toothpicks of sodium carbonate and testing the solution in the last three wells to see how many different colors you can get. 4. How does the color of the indicator solution as the sodium carbonate solution becomes more concentrated?
6 5. How does the number on the ph scale change as the concentration of base increases? 6. In this activity, you did not add any citric acid solution or sodium carbonate to the first well in each spot plate. What is the purpose of leaving the first well green? TAKE IT FURTHER Question to Investigate How will the color change as you slowly pour your acid and base solutions into the indicator? Universal indicator solution ph color chart Citric acid solution Sodium carbonate solution 1. Pour a small amount of either your citric acid solution or sodium carbonate solution into your indicator solution. Swirl and compare the color to your Universal Indicator ph Color Chart. 2. Pour a small amount of the other solution into your indicator solution. Swirl and compare the color to your color chart. 3. Continue to pour small amounts of the acid and base solutions into your indicator until the solutions are used up. 7. What did you observe as you slowly poured your acid and base solutions into the indicator solution?
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