CHEMICAL CALCULATIONS AND QUANTITATIVE ANALYSIS - TITRATION
Title:
Carry out quantitative analysis
Credits: 4
Assessment: Internal
Date version published: 17 November 2011
This standard involves carrying out quantitative analysis.
Achievement Criteria
Achievement
· Carry out quantitative analysis.
Achievement with Merit
· Carry out in-depth quantitative analysis.
Achievement with Excellence
· Carry out comprehensive quantitative analysis.
Explanatory Notes
1 This achievement standard is derived from The New Zealand Curriculum, Learning Media, Ministry of Education, 2007, Level 7. The standard is aligned to the Nature of Science achievement objectives and the Material World achievement objectives, and is related to the material in the Teaching and Learning Guide for Chemistry, Ministry of Education, 2010 at http://seniorsecondary.tki.org.nz.
2 Procedures outlined in Safety and Science: a Guidance Manual for New Zealand Schools, Learning Media, Ministry of Education, 2000, should be followed.
3 Quantitative analysis involves collecting primary data from an acid-base titration, and processing both primary and secondary data to solve quantitative problems.
· The standard solution to be used in the titration may be provided. The titration procedure and balanced equations will be provided.
· Student selected data will be used in determining the accuracy of the titration.
Carry out quantitative analysis involves:
· collecting titration data that contains at least three titre values that fall within a range of 0.4 mL; the average titre value must be within 0.8 mL of the expected outcome
· solving quantitative problems that use the relationships n=m/M and c=n/V to calculate one variable given the other two (the relationships are not given). Molar masses for substances may be provided. Calculations must be carried out using appropriate procedures (not provided).
Carry out in-depth quantitative analysis involves:
· collecting titration data that contains at least three titre values that fall within a range of 0.4 mL; the average titre value must be within 0.5 mL of the expected outcome
· solving quantitative problems that involve at least two steps and require application of relationships such as n=m/M and c=n/V. Titration calculations must be carried out correctly using only concordant titre values.
Carry out comprehensive quantitative analysis involves:
· collecting titration data that contains at least three titre values that fall within a range of 0.2 mL; the average titre value must be within 0.2 mL of the expected outcome
· solving quantitative problems that involve more than two steps, and the use of stoichiometric principles. Answers to calculations must demonstrate correct units and appropriate use of significant figures.
4 Conditions of Assessment related to this achievement standard can be found at www.tki.org.nz/e/community/ncea/conditions-assessment.php.
Carry out quantitative analysis
Credits: 4
Assessment: Internal
Date version published: 17 November 2011
This standard involves carrying out quantitative analysis.
Achievement Criteria
Achievement
· Carry out quantitative analysis.
Achievement with Merit
· Carry out in-depth quantitative analysis.
Achievement with Excellence
· Carry out comprehensive quantitative analysis.
Explanatory Notes
1 This achievement standard is derived from The New Zealand Curriculum, Learning Media, Ministry of Education, 2007, Level 7. The standard is aligned to the Nature of Science achievement objectives and the Material World achievement objectives, and is related to the material in the Teaching and Learning Guide for Chemistry, Ministry of Education, 2010 at http://seniorsecondary.tki.org.nz.
2 Procedures outlined in Safety and Science: a Guidance Manual for New Zealand Schools, Learning Media, Ministry of Education, 2000, should be followed.
3 Quantitative analysis involves collecting primary data from an acid-base titration, and processing both primary and secondary data to solve quantitative problems.
· The standard solution to be used in the titration may be provided. The titration procedure and balanced equations will be provided.
· Student selected data will be used in determining the accuracy of the titration.
Carry out quantitative analysis involves:
· collecting titration data that contains at least three titre values that fall within a range of 0.4 mL; the average titre value must be within 0.8 mL of the expected outcome
· solving quantitative problems that use the relationships n=m/M and c=n/V to calculate one variable given the other two (the relationships are not given). Molar masses for substances may be provided. Calculations must be carried out using appropriate procedures (not provided).
Carry out in-depth quantitative analysis involves:
· collecting titration data that contains at least three titre values that fall within a range of 0.4 mL; the average titre value must be within 0.5 mL of the expected outcome
· solving quantitative problems that involve at least two steps and require application of relationships such as n=m/M and c=n/V. Titration calculations must be carried out correctly using only concordant titre values.
Carry out comprehensive quantitative analysis involves:
· collecting titration data that contains at least three titre values that fall within a range of 0.2 mL; the average titre value must be within 0.2 mL of the expected outcome
· solving quantitative problems that involve more than two steps, and the use of stoichiometric principles. Answers to calculations must demonstrate correct units and appropriate use of significant figures.
4 Conditions of Assessment related to this achievement standard can be found at www.tki.org.nz/e/community/ncea/conditions-assessment.php.
