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c) (i) Describe a procedure for carrying out a flame test on the white salt - Leaving Cert Chemistry - Question c - 2018
Question c
c) (i) Describe a procedure for carrying out a flame test on the white salt. To carry out a flame test on a white salt, follow these steps: 1. Clean a platinum (ni... show full transcript
Worked Solution & Example Answer:c) (i) Describe a procedure for carrying out a flame test on the white salt - Leaving Cert Chemistry - Question c - 2018
Step 1
Describe a procedure for carrying out a flame test on the white salt.
Answer
To carry out a flame test on a white salt, follow these steps:
- Clean a platinum (nichrome) wire by dipping it in concentrated hydrochloric acid (HCl) to remove any contaminants.
- Rinse the wire with distilled water to remove any acid residue.
- Dip the clean wire into a small amount of the white salt (for this procedure use a small spatula).
- Place the tip of the wire into a clean blue part of a Bunsen burner flame.
- Observe the color produced in the flame.
Step 2
Step 3
Step 4
Give a reason why potassium metal reacts more violently than sodium metal with chlorine gas.
Answer
Potassium metal reacts more violently than sodium metal with chlorine gas because potassium has a greater atomic radius and lower ionization energy, making it easier to lose its outer electron. This results in a more exothermic reaction with chlorine gas.