List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.
Elements describe the essential outcomes. | Performance criteria describe the performance needed to demonstrate achievement of the element. |
1 | Prepare solutions | 1.1 | Select appropriate procedure for solution preparation |
| 1.2 | Select equipment, materials and solvent of specified purity |
| 1.3 | Measure appropriate quantities of reagents for solution preparation and record data. |
| 1.4 | Select and assemble specified laboratory equipment and appropriate grade of glassware |
| 1.5 | Perform specified dilutions |
| 1.6 | Prepare solutions to achieve homogeneous mix of the specified concentration |
| 1.7 | Label and store solutions to maintain identity and stability |
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2 | Standardise and use volumetric solutions | 2.1 | Assemble appropriate laboratory equipment |
| 2.2 | Perform serial dilutions as required |
| 2.3 | Standardise the solution to the required specified range and precision |
| 2.4 | Label and store solutions to maintain identity and stability |
| 2.5 | Use standard volumetric solutions to determine concentration of unknown solutions |
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3 | Calculate and record data | 3.1 | Calculate specified concentrations |
| 3.2 | Use authorised procedure if data is to be modified |
| 3.3 | Estimate and document uncertainty of measurement in accordance with workplace procedures, as required |
| 3.4 | Record all relevant details according to laboratory procedures and report results |
| 3.5 | Report concentration with appropriate units |
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4 | Monitor the quality of laboratory solutions | 4.1 | Check solutions for visual deterioration and expiry date |
| 4.2 | Re-standardise or dispose of dated or deteriorated solutions |
| 4.3 | Record details and label solutions according to laboratory procedures |
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5 | Maintain a safe work environment | 5.1 | Use established safe work practices and personal protective equipment (PPE) to ensure personal safety and that of other laboratory personnel |
| 5.2 | Clean up spills using appropriate techniques to protect personnel, work area and environment |
| 5.3 | Minimise generation of waste and environmental impacts |
| 5.4 | Ensure the safe collection of laboratory and hazardous waste for subsequent disposal |
| 5.5 | Store equipment and reagents as required |
Evidence of competence in this unit must satisfy all of the requirements of the elements and performance criteria, and include demonstration of:
preparing and standardising at least three (3) different solutions in accordance workplace procedures and/or standard methods
using balances and volumetric glassware accurately
selecting and using primary and secondary standards and indicators
performing titrations using laboratory procedures with required accuracy and precision and within required timelines
determining equivalence points using indicators and graphical methods
calculating the concentration of the solution with appropriate units and uncertainties given the chemical reaction for the titration
performing quality assurance checks for solution performance
recognising control results that are not within acceptable range
recording and reporting results in accordance with workplace procedures
labelling and storing solutions, safely cleaning up spills and collecting and disposing of waste in accordance with workplace procedures
working safely at all times by following established safe work practices and using safety information and safety equipment.
Must provide evidence that demonstrates knowledge of:
solution terminology
the chemistry of acids, bases, buffers and redox reactions
Moles and Molarity
scientific terminology for different types of solutions
chemical symbols and Atomic Mass
formulae for calculating concentration
concepts of metrology, including:
all measurements are estimates
measurements belong to a population of measurements of the measured parameters
precision, accuracy and significant figures
sources of error, uncertainty and repeatability
traceability
international system of units (SI)
grades of glassware, reagents and their use
reactions used for standardisation and desirable characteristics
workplace procedures, standard methods and calculations used for preparing, standardising and monitoring the quality of solutions used in job role
workplace communication and reporting procedures
relevant hazards, work health and safety (WHS) and environment requirements.
Judgment of competence must be based on holistic assessment of the evidence. Assessment methods must confirm consistency of performance over time, rather than a single assessment event.
This unit of competency is to be assessed in the workplace or a simulated workplace environment. A simulated workplace environment must reflect realistic operational workplace conditions that cover all aspects of workplace performance, including the environment, task skills, task management skills, contingency management skills and job role environment skills.
Foundation skills are integral to competent performance of the unit and should not be assessed separately.
Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.
Knowledge evidence may be collected concurrently with performance evidence or through an independent process, such as workbooks, written assessments or interviews (provided a record is kept in each case).
This unit of competency may be assessed with:
relevant MSL974000 series units of competency, and
relevant MSL975000 series units of competency dealing with sampling, tests and measurements
Holistic assessment methods include:
inspection and/or testing of solutions prepared by the candidate
review of records and workplace documentation completed by candidate
review of work outputs by the candidate over time to ensure accuracy, consistency and timeliness
observation of the candidate preparing, standardising and using a range of solutions
feedback from peers and supervisors about the candidate’s ability to consistently prepare and standardise solutions that are fit for purpose
oral/written questions about key steps in solution preparation and standardisation, calculations, common hazards and safety procedures.
Access is required to instruments, equipment, materials, workplace documentation, procedures and specifications associated with this unit, including, but not limited to:
a standard laboratory equipped with appropriate reagents and equipment to prepare and standardise solutions, such as pH meters; balances; magnetic stirrers, water baths and hot plates; measuring cylinders, beakers, conical flasks, volumetric flasks, pipettes and burettes; filter papers and funnels; and fume cupboards
standard methods and workplace procedures
containers and storage facilities.
Assessors must satisfy the assessor competency requirements that are in place at the time of the assessment as set by the VET regulator.
The assessor must demonstrate both technical competence and currency.
Technical competence can be demonstrated through:
relevant VET or other qualification/Statement of Attainment AND/OR
relevant workplace experience.
Currency can be demonstrated through:
performing the competency being assessed as part of current employment OR
having consulted with a laboratory about performing the competency being assessed within the last twelve months.