Carry out Quantitative Analysis (Achievement Standard 91161)
Overview
- Subject Reference: Chemistry 2.1
- Level: 2
- Credits: 4
- Assessment: Internal
- Status: Expiring
- Expiry Date: 31 December 2019
Key Components
- Achievement, Merit, and Excellence Criteria:
- Carry out basic, in-depth, and comprehensive quantitative analysis.
Explanatory Notes
- Curriculum Alignment:
- Derived from The New Zealand Curriculum (2007) and aligned with Nature of Science and Material World achievement objectives.
- Related to Te Marautanga o Aotearoa achievement objectives.
- Safety Procedures:
- Follow guidelines from "Safety and Science: a Guidance Manual for New Zealand Schools" (2000).
- Quantitative Analysis Details:
- Involves collecting primary data from acid-base titration.
- Processing primary and secondary data to solve quantitative problems.
- Standard solution and titration procedure provided, student selects data for accuracy determination.
- Conditions of Assessment:
- Available at NCEA resources for internally assessed achievement standards.
Criteria for Achievement Levels
- Achievement:
- Collect titration data with at least three titre values within 0.4 mL range.
- Average titre value within 0.8 mL of expected outcome.
- Solve problems using relationships n=m/M and c=n/V.
- Merit:
- Titration data within 0.5 mL range; two-step problems; use only concordant titre values.
- Excellence:
- Titration data within 0.2 mL range; multi-step problems with stoichiometric principles.
- Correct units and appropriate significant figures in calculations.
Replacement Information
- Replaced by Achievement Standard AS91910.
- Originally replaced AS90306, AS90763, and unit standard 8940.
Quality Assurance
- Consent to Assess:
- Providers must have NZQA consent to register credits.
- Moderation System:
- Organisations must engage with applicable moderation systems.
Additional Resources
This Achievement Standard emphasizes the importance of precision in quantitative analysis and data accuracy in chemistry. Understanding titration and related calculations is crucial for achieving high levels in this standard. As the standard is expiring, ensure assessments are completed before the expiry date.