Difference between revisions of "GCSE Chemistry Required Practical: Purifying Water"
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#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]]. | ||
| − | ==== | + | ====Finding Solutes==== |
| + | #[[Measure]] the [[mass]] of a [[Watch Glass]]. | ||
| + | #Add 4ml of a [[water]] [[sample]] to the [[Watch Glass|watch glass]]. | ||
| + | #Add 150ml of tap [[water]] to 250ml [[beaker]]. | ||
| + | #Place the [[Watch Glass|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|watch glass]] has [[evaporating|evaporated]]. | ||
| + | #Allow the [[water]] to cool and then [[observe]] the [[Watch Glass|watch glass]] for any remaining [[solute]]s. | ||
| + | #Measure the [[mass]] of the [[Watch Glass]] with [[solute]]s and subtract the [[mass]] of the [[Watch Glass|watch glass]] to find the [[mass]] of the [[solute]]s. | ||
| + | #Repeat the [[experiment]] for each [[water]] [[sample]] using a clean [[Watch Glass|watch glass]] each time. | ||
| + | ====Purifying Water==== | ||
| + | #Add 40ml of a [[water]] [[sample]] to a 100ml [[Conical Flask|conical flask]]. | ||
| + | #Attach a [[bung]] and [[Delivery Tube|delivery tube]] to the top of the [[Conical Flask|conical flask]]. | ||
| + | #Place a [[Test Tube]] in a cold [[Water Bath|water bath]]. | ||
| + | #Heat the [[water]] [[sample]] in the [[Conical Flask|conical flask]] and arrange the [[Delivery Tube|delivery tube]] to pass the [[Water Vapour|water vapour]] into the cold [[Test Tube|test tube]] where it will [[condensing|condense]]. | ||
| + | #Use the [[water]] collected to repeat tests for [[pH]] and finding [[solute]]s. | ||
| + | #Repeat 1-5 for each [[water]] [[sample]]. | ||
Revision as of 13:00, 29 January 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.