3.1 Quantitavtive investigations

as91387.pdf

This internal is completed during the first 4 weeks of term 3.

Learn

This internal requires you to pick an experiment of your choice and to use a quantitative method to collect and process data to make a valid conclusion.

Intro to the internal slides- please read through carefully!

3.1 Quantitative analysis

Quantitative methods

Titrations

Using the knowledge from last year you can choose to do titrations. The experimental setup and calculations are the exact same as last year. Refer to your Scipad from last year or there are a couple of pages in this years SciPad to refresh your memory.

If not this video should help:

Calorimetry

This is the alternative to titrations. It analyses concentrations of unknown solutions by measuring the colour absorption of that sample. You will need to make a standard curve of known concentrations to absorptions so that when you measure your unknown sample you can look at your standard graph and calculate its concentration.

Pick an experiment to investigate

Link to UC website which gives example experiments for this internal. Best to go through each of them and see which one interests you.

https://www.canterbury.ac.nz/study/academic-study/science/science-outreach-for-schools/learning-resources/chemistry-workshops

You can complete the experimental work either in a pair or individually but the report must be solely your work.

Link to planning document:

3.1 master copy 2025

General Chemistry Reminders

Entry in your logbook every lesson.
In doing calculations do not round numbers until your final answer and then use 3 significant figures.
Rinse out all equipment at the start of the lesson and whenever new chemicals are going in them.
Use distilled water, never tap water.
Measure liquids to the meniscus.
Measure on a flat steady surface.
The more precise you are and care you take, the better your results will be.

Create

You will submit 2 pieces of work to me for this internal. Your logbook and your report.

Logbook

An ongoing diary of what you do each lesson, from your initial thinking to what experiment you are wanting to do, to the raw data from your experimental work. This is the evidence of your participation in this internal, which is a compulsory component.

The Report

You will also prepare a report which covers the following points (SciPad page 18):

Marking Schedule (SciPad page 19):

Assessment Schedule

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