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Chemistry Mock Required Practicals (Making Salts (Method (Measure around…
Chemistry Mock Required Practicals
Making Salts
Method
Measure around 40 cm cubed sulfuric acid into a beaker and heat gently using a Bunsen burner.
Use a spatula to add excess amounts of copper oxide and stir it with a glass rod.
Filter the beaker's contents into a conical flask (colour should be blue).
Pour contents into an evaporating basin and evaporate until crystals start to form.
Risk Assessment Involved
Wear
safety goggles
throughout the practical.
Key Details
It is the
preparation
of
pure dry
copper sulfate crystals.
You
could be asked on any salt method
, not just copper oxide.
Neutralisation
Method
Using a piette and pipette filler, put exactly 25 cm cubed sodium hydroxide into a conical flask.
Fill a burette with dilute sulfuric acid and add 5-10 drops of methyl orange indicator into the conical flask.
Carefully open the tap so that the acid flows out at a drop-by-drop rate.
Shut the tap immediately after one drop of acid causes the colour to turn permanently red.
Risk Assessment Involved
Wear
safety goggles
throughout the practical.
Key Details
Main aim is to observe the colour change to determine the volume of dilute sulfuric acid needed to neutralise sodium hydroxide.
Electrolysis
Method
Pour around 50 cm cubed copper chloride solution into a beaker,
Add a lid and insert carbon rods through the holes, ensuring the rods don't touch.
Attach crocodile leads to the rods making sure they are direct current (charges will alternate otherwise).
Switch power on at 4V and observe whether any electrodes are bubbling.
Hold a piece of blue litmus paper next to the positive electrode and write down your observations.
Turn power supply off after no more than five minutes and observe the negative electrode.
Risk Assessment Involved
Wear
safety goggles
throughout the practical.
Key Details
You are investigating the elements formed at each electrode when different salt solutions are electrolysed.
Temperature Changes
Method
Measure 30 cm cubed dilute hydrochloric acid into a polystyrene cup and stand it inside a beaker.
Using a thermometer, measure and record the temperature of the acid.
Add 5 cm cubed sodium hydroxide solution into a measuring cylinder and pour it into the cup, stirring gently.
Repeat the previous two steps adding a further 5 cm cubed sodium hydroxide each time until a total of 40 cm cubed is added.
Risk Assessment Involved
Wear
safety goggles
throughout the practical.
Key Details
Monitoring temperature rise as small volumes of sodium hydroxide solution are added to dilute hydrochloric acid.