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C3 - Chemistry in Action
Transcript of C3 - Chemistry in Action
Topic 2 - Qualitative Analysis
1 Water Solutes
2.1 Calculate the concentration of solutions in g dm-3
2.2 Demonstrate an understanding that some areas of the country have dissolved calcium or magnesium ions in their tap water and that the presence of these ions makes the water hard
2.3 Describe problems caused by hard water, including: a) it does not easily form a lather with soap b) it reacts with soap to form a precipitate (‘scum’), which causes soap to be wasted
HSW 11 Presenting information, developing an argument and drawing a conclusion, using scientific, technical and mathematical language, conventions, and symbols and ICT.
2 Hard & Soft Water
2.4 Describe hard water as either temporary or permanent, and describe how boiling removes temporary hardness but not permanent hardness
2.5 Explain how hard water can be softened by removing the dissolved calcium and/or magnesium ions and that this can be done by: a) boiling (for temporary hard water only) b) using an ion exchange resin
3 Finding the Mass of Solute in Solution
2.6 Evaporate a solution to dryness to determine the mass of solute dissolved in a solution
D/C - Know which ions are dissolved in water that makes it 'hard' or 'soft'
B/C - Describe some of the problems that hard/soft water causes
A/A* - Calculate the concentration of solutions in g/dm3
Calculate concentration of solutions in g/dm3
Collect primary qualitative and quantitative data
Define the following words:
Complete the practical to investigate which how the
type of water
affects how well soap forms a
The concentration of a solution tell you how much
is dissolved in how much
It is given in g/dm3 (grams per litre)
The calculation therefore is...
Complete worksheet C3.5a
which one is the independent and which is the dependent variable?
Add the highlighted terms to your glossary of keywords
Problems with 'hard' water
What did you notice about how the 'hardness' of the water affected how easily a lather formed?
In 'hard' water, what else is formed when soap is added?
Video Revision - Recap and Review
Complete the summary sheet to check your understanding
D/C - Know the difference between temporary and permanent hard water
B/C - Describe how water can be softened using boiling or ion exchange
A/A* - Explain how an ion exchange resin works to soften water
Collect primary qualitative data
Describe the difference.
Temporary Hard Water
Permanent Hard Water
Complete the practical to investigate the effect of
which one is the independent and which is the dependent variable?
To prepare for next lesson you must make sure you have read through the following 2 pages from the GCSE Bitesize website.
(you only need to read the first page)
(just page 4)
D/C - Produce a simple plan and carry out the investigation safely
C/B - Produce a plan including a hypothesis, controlled variables and a sensible range and carry this out
A/A* - Carry out the investigation you have planned and present the results in an appropriate way
Planning an investigation to collect valid results
Presenting quantitative data in tables and graphs
4 Particles and Moles
H 2.7 Demonstrate an understanding that the amount of a substance can be measured in grams, number of particles or number of moles of particles
H 2.8 Convert masses of substances into moles of particles of the substance and vice versa
H 2.9 Convert concentration in g dm-3 into mol dm-3 and vice versa
Soluble Salts (Part 1)
2.10 Demonstrate an understanding that if soluble salts are prepared from an acid and an insoluble reactant:
a) excess of the reactant can be added to ensure that all the acid is used up
b) the excess reactant can be removed by filtration
c) the solution remaining is only salt and water
6 Preparing Soluble Salts (Part 2)
2.11 Demonstrate an understanding that if soluble salts are prepared from an acid and a soluble reactant:
a) titration must be used to determine the exact amount of the soluble reactant that reacts with the acid b) the acid and the soluble reactant can then be mixed in the correct proportions c) the solution remaining after reaction is only salt and water
2.12 Describe an acid–base titration as a neutralisation reaction where hydrogen ions (H+) from the acid react with hydroxide ions (OH-) from the base
7 Acid/Alkali Titration
2.13 Describe how to carry out simple acid-base titrations using burette, pipette and suitable acid-base indicators
2.14 Carry out an acid-base titration to prepare a salt from a soluble base
8 Titrations and Calculations
H 2.15 Carry out simple calculations using the results of titrations to calculate an unknown concentration of a solution or an unknown volume of solution required
9 Revise and Review
To Prepare for next lesson make sure you try the interactive investigation by clicking the link below
Pay attention to the different steps in the practical and make a note of what is changed and what is kept the same in each case
Watch the Video by clicking on the Youtube Link to get an idea of what a 'mole' is and why it is important to Chemists
In the next lesson you will be working with moles so be prepared!
Look through the slides in the powerpoint
It goes over work from your Core Science which you have already studied, but is a very useful reminder
Pay particular attention to the section on 'Making Salts'
Go through the slides on the presentation, it will go over how different salts are made.
Pay attention to the chemical reactions and symbols used in each example
Watch the video. It discusses what a 'TITRATION' is and what they are used for.
Pay particular attention to the procedure/method that they use as you will be conducting your own titration in the next lesson and should be familiar with the different steps.
I would recommend taking notes on the different steps
Watch the video which goes through how to use a titration to find out the unknown concentration.