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With my year 11s we have 2 hours of lesson time left on Chemistry before they go on study leave.
I have tried to do titration calculations with them for 2 lessons and all im seeing is glazed over eyes and faces.
Has anyone got any tips/hints for teaching Titration calculations?
make sure they can do n=m/Mr and n=CxV. they chould be ok if they can do those and remember the difference between cm3 and dm3 and conversions thereof.
When i taught it I got them to focus on the data in the question and let that lead them to the right equation to use eg if you see mass, use n=m/rmm, if you see a volume of gas use n=v/24 and if you see a volume of solution use n=cv.
Very few of them get the concept of the mole so i would just teach the maths and teach them to identify what formula to use and keep the conceptual teaching very simple.
I really like the idea of putting it in a table. It has deffinately helped me as a biologist to understand what is going on myself. going to try this out tomorrow and I will let you know how it goes
Thought of trying the C1V1=C2V2 approach.
Often they can get the answer (even if they don't quite know how)
1. Write the neutralisation formula
2. Balance it
3. How much stuff have you got? (strength x volume)
4. How much of the other stuff will you need to neutralise it?
5. So do a simple sum
6. Does it feel right? E.g. if it's a 1:1 neutralisation (eg NaOH + HCl) and does a slightly stronger conc require a lower volume?
Makes you long for the discipline of slide rules... does the number feel right? Work out yourself where the decimal place should be
I'm having a similar problem with some students - They can all do it with thought in lessons, but not in the exam.
I have decided that next week will be Calculation week. All pupils will see me every lunchtime to do two calculation problems - Titration and Empirical from combustion data - before going to lunch (They will do it as they want to improve) - i'm hoping small repitition over a long term will help - I will then run an after school on Friday to mop up, and present a little award for encouragement and achievement over the week.
It always amazes me the fact that pupils ignore the power or repetition.
I teach Titration Calculations as a "Murder Mystery" theme. It may sound crazy but it works. All the pupils love it and start doing titration calculations and forget about the fact that it also involves some maths.
The whole resource is on TES - Take my user id and check my resources - yoy should find it.
Let me know if you don't and I'll email you the full resource.
Phil Wootton - Chemistry Teacher Kirckcaldy High School
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