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WorksheetsSalt preparation
Total questions: 22
Worksheet time: 11mins
What safety equipment is important for this practical activity?
Goggles and gloves
A fume hood
Safety boots
Respirator
What apparatus is essential for warming the acid?
Bunsen burner
Water bath or larger beaker with hot water
Tripod
Evaporating basin
What is added to the sulfuric acid during the reaction?
Copper sulfate solution
Copper oxide powder
Filter paper
Residue
Why is copper oxide added until it is in excess?
To speed up crystallisation
To ensure all the acid reacts
To produce more filtrate
To increase evaporation
What is the purpose of filtration in this experiment?
To heat the mixture
To separate the copper sulfate solution from unreacted copper oxide
To cool the mixture
To measure the temperature
What is the filtrate?
Residue of copper oxide
Dilute sulfuric acid
Copper sulfate solution
Pure water
What is discarded after filtration?
Filtrate
Crystals
Residue
Gauze
Why is a Bunsen burner used during crystallisation?
To heat the evaporating basin directly
To produce hydrated crystals immediately
To heat water in the beaker below the evaporating basin
To filter impurities
How is the heat adjusted during crystallisation?
By boiling the water rapidly
By using a simmering flame
By cooling the beaker frequently
By stopping after 5 minutes
Why should all the water in the evaporating basin not be evaporated?
To prevent overheating of the copper sulfate solution
To speed up the drying process
To avoid burning the crystals
To ensure the residue is dry
Where can the evaporating basin be left after heating?
In direct sunlight
In a drying oven or for a few days to cool
In the refrigerator
In a sealed container
What colour should the hydrated copper sulfate crystals be?
Green
Blue
Purple
Yellow
What should be done during the analysis step?
Crush the crystals
Compare the crystals' appearance to the expected description
Heat the crystals further
Measure the filtrate
What shape are hydrated copper sulfate crystals expected to have?
Irregular and dull
Round and transparent
Regularly shaped
Triangular
What could differences in the appearance of the crystals indicate?
Incorrect filtration
Errors in the evaporation or crystallisation process
The residue was used instead of the filtrate
Insufficient use of copper oxide
Colour of Copper Sulphate crystals is ?
Red
Green
Blue
White
after the dissolution of crystals to form a solution, filtration is done to?
Remove water soluble impurities
Remove water insoluble impurities
To change colour of the solution
None of the above
The process of cooling of crystals should be done at a ________ rate
Fast
Moderate
Slow
Any
Crystallisation is based on the ____________
Difference in melting point
Difference in boiling point
Difference in pressure
Difference in solubility
Insoluble impurities from solution during crystallization are removed by ____________
Drying
Filtration
Heating
Cooling
Pure Copper Sulphate Crystals can be obtained by ________.
Centrifugation
Distillation
Crystallisation
Filtration
Crystals are dried with the help of?
Dryer
Burner
Filter paper
All of the above
