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Constructed Response . Topic 8: Acids, bases and salt
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Set D: Neutralization, changes on indicator, comparison of H3O concentration, pH
Base your answers to questions 8 through 10 on the information below.
A student was studying the pH difference in samples from two Adirondack streams.
The student measured a pH of 4 in stream A and a pH of 6 in stream B.
8. Identify one compound that could be used to 8.
neutralize the sample from stream A.
9. What is the color of bromthymol blue in the 9.
sample from stream A?
10. Compare the hydronium ion concentration in stream A 10.
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to the hydronium ion concentration in stream B.
Set E. Titration, titration calculation, significant figures
Base your answers to questions 10 through 12 on the information below.
In a tit ration, 3.00 M NaOH(aq) was added to an Erlenmeyer flask containing
25.00 millimeters of HCl(aq) and three drops of phenolphthalein until one drop
of NaO H(aq) turned the solution a light-pink color. The following data were collected
by a student performing this titration.
Initial NaOH(aq) buret reading: 14. 45 milliliters
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Final NaOH(aq) buret reading: 32.66 milliliters
Write answers here.
11. What is the total volume of NaOH(aq) that was 11.
used in the titration?
12. Show a correct numerical setup for calculating 12.
the molarity of HCl(aq).
13. Based on the data given, what is the correct 13.
number of significant figures that should be
shown in molarity of HCl(aq) ?
Set F: Color chang e of indicators.
Indicate the color of the given indicators based on the pH of the solution.
14. Litmus in a solution with a pH of 11 14.
15. Bromthymol blue in a solution with a pH of 4 15.
16. Methyl orange in a solution with a pH of 3.5. 16.
392 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
+
Set D: Neutralization, changes on indicator, comparison of H3O concentration, pH
Base your answers to questions 8 through 10 on the information below.
A student was studying the pH difference in samples from two Adirondack streams.
The student measured a pH of 4 in stream A and a pH of 6 in stream B.
8. Identify one compound that could be used to 8.
neutralize the sample from stream A.
9. What is the color of bromthymol blue in the 9.
sample from stream A?
10. Compare the hydronium ion concentration in stream A 10.
Teacher Preview Copy
to the hydronium ion concentration in stream B.
Set E. Titration, titration calculation, significant figures
Base your answers to questions 10 through 12 on the information below.
In a tit ration, 3.00 M NaOH(aq) was added to an Erlenmeyer flask containing
25.00 millimeters of HCl(aq) and three drops of phenolphthalein until one drop
of NaO H(aq) turned the solution a light-pink color. The following data were collected
by a student performing this titration.
Initial NaOH(aq) buret reading: 14. 45 milliliters
Teacher Preview Copy
Final NaOH(aq) buret reading: 32.66 milliliters
Write answers here.
11. What is the total volume of NaOH(aq) that was 11.
used in the titration?
12. Show a correct numerical setup for calculating 12.
the molarity of HCl(aq).
13. Based on the data given, what is the correct 13.
number of significant figures that should be
shown in molarity of HCl(aq) ?
Set F: Color chang e of indicators.
Indicate the color of the given indicators based on the pH of the solution.
14. Litmus in a solution with a pH of 11 14.
15. Bromthymol blue in a solution with a pH of 4 15.
16. Methyl orange in a solution with a pH of 3.5. 16.
392 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
