[Catalist] WACE: ATAR Year 12 Chemistry: Buffer Solutions

[Michael McGarry]

Greetings Science Colleagues,


“Buffer solutions are conjugate in nature and resist changes in pH when small amounts of strong acid or base are added to the solution; buffering capacity can be explained qualitatively; Le Châtelier’s Principle can be applied to predict how buffers respond to the addition of hydrogen ions and hydroxide ions.” [Page 12]


Reference: SCSA WACE ATAR URL: http://wace1516.scsa.wa.edu.au/__data/assets/pdf_file/0012/10605/Chemistry-Y12-Syllabus-AC-ATAR-GD.pdf <http://wace1516.scsa.wa.edu.au/__data/assets/pdf_file/0012/10605/Chemistry-Y12-Syllabus-AC-ATAR-GD.pdf>
A recent post to STAWA’s CATALIST e-forum motivated me to ask these two Questions.


Question 1: Would a significant proportion of Australian Year 12 secondary chemistry students have the mathematical skills to be able to satisfactory explain quantitatively buffering capacity?


Question 2: Do the commercially available Year 12 Chemistry textbooks written for the SCSA WACE ATAR Year 12 Chemistry syllabus include a text section that explains quantitatively buffering capacity?


Useful URL’s on Buffer Solutions

URL 1: http://www.mhhe.com/physsci/chemistry/chang7/ssg/chap16_2sg.html <http://www.mhhe.com/physsci/chemistry/chang7/ssg/chap16_2sg.html>
URL 2: https://www.chem.purdue.edu/gchelp/howtosolveit/Equilibrium/Buffers.htm <https://www.chem.purdue.edu/gchelp/howtosolveit/Equilibrium/Buffers.htm>
URL 3: http://scifun.chem.wisc.edu/CHEMWEEK/BioBuff/BioBuffers.html <http://scifun.chem.wisc.edu/CHEMWEEK/BioBuff/BioBuffers.html>
URL 4: https://www.rose-hulman.edu/~brandt/Chem330/pH_and_Buffers.pdf <https://www.rose-hulman.edu/~brandt/Chem330/pH_and_Buffers.pdf>
URL 5: http://virtuallaboratory.colorado.edu/CLUE-Chemistry/chapters/chapter9txt-2.html <http://virtuallaboratory.colorado.edu/CLUE-Chemistry/chapters/chapter9txt-2.html>
URL 6: https://www.chem.purdue.edu/courses/chm333/Spring%202013/Lectures/Spring%202013%20Lecture%205.pdf <https://www.chem.purdue.edu/courses/chm333/Spring%202013/Lectures/Spring%202013%20Lecture%205.pdf>
URL 7: http://www.ulm.edu/chemistry/courses/manuals/chem1010/experiment_09.pdf <http://www.ulm.edu/chemistry/courses/manuals/chem1010/experiment_09.pdf>
URL 8: https://www.une.edu.au/__data/assets/pdf_file/0003/121728/chemistry-teacher-notes-answers.pdf <https://www.une.edu.au/__data/assets/pdf_file/0003/121728/chemistry-teacher-notes-answers.pdf>
Best Wishes,


Michael John McGarry

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