Difference between revisions of "GCSE Chemistry Required Practical: Purifying Water"
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==Key Stage 4== | ==Key Stage 4== | ||
| + | {{#ev:youtube|https://www.youtube.com/watch?v=_UGHsbTEBvA}} | ||
===Meaning=== | ===Meaning=== | ||
| − | Analysis and [[purification]] of [[water]] from different sources. | + | Analysis and [[Pure|purification]] of [[water]] from different sources. |
===Method=== | ===Method=== | ||
A sample of rain water, sea water and bottled 'spring' water should be supplied. | A sample of rain water, sea water and bottled 'spring' water should be supplied. | ||
====Testing the pH==== | ====Testing the pH==== | ||
| − | #Using a clean [[ | + | #Using a clean [[pipette]]s to add 2ml of a [[water]] [[sample]] to a [[Test Tube|test tube]] and label it. |
#Add 2 drops of [[pH Indicator]] to the [[Test Tube|test tube]] and record the [[colour]] and [[pH]]. | #Add 2 drops of [[pH Indicator]] to the [[Test Tube|test tube]] and record the [[colour]] and [[pH]]. | ||
#Repeat steps 1 and 2 for each [[water]] [[sample]]. | #Repeat steps 1 and 2 for each [[water]] [[sample]]. | ||
| Line 25: | Line 26: | ||
#Use the [[water]] collected to repeat tests for [[pH]] and finding [[solute]]s. | #Use the [[water]] collected to repeat tests for [[pH]] and finding [[solute]]s. | ||
#Repeat 1-5 for each [[water]] [[sample]]. | #Repeat 1-5 for each [[water]] [[sample]]. | ||
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| + | ===References=== | ||
| + | ====AQA==== | ||
| + | |||
| + | :[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Purification of water, pages 208-209, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] | ||
Latest revision as of 23:11, 10 November 2019
Contents
Key Stage 4
Meaning
Analysis and purification of water from different sources.
Method
A sample of rain water, sea water and bottled 'spring' water should be supplied.
Testing the pH
- Using a clean pipettes to add 2ml of a water sample to a test tube and label it.
- Add 2 drops of pH Indicator to the test tube and record the colour and pH.
- Repeat steps 1 and 2 for each water sample.
Finding Solutes
- Measure the mass of a Watch Glass.
- Add 4ml of a water sample to the watch glass.
- Add 150ml of tap water to 250ml beaker.
- Place the watch glass on top of the beaker.
- Heat the water in the beaker to boiling and keep boiling until all the water in the watch glass has evaporated.
- Allow the water to cool and then observe the watch glass for any remaining solutes.
- Measure the mass of the Watch Glass with solutes and subtract the mass of the watch glass to find the mass of the solutes.
- Repeat the experiment for each water sample using a clean watch glass each time.
Purifying Water
- Add 40ml of a water sample to a 100ml conical flask.
- Attach a bung and delivery tube to the top of the conical flask.
- Place a Test Tube in a cold water bath.
- Heat the water sample in the conical flask and arrange the delivery tube to pass the water vapour into the cold test tube where it will condense.
- Use the water collected to repeat tests for pH and finding solutes.
- Repeat 1-5 for each water sample.