Question

what colours do you observe when a pinch of cupric chloride,stronium chloride and on a watch glass and make a paste with conc HCL.Take this paste on a platinum loop into a non-luminous flame?

Answer 1

Answer:

Take a pinch of cupric chloride in a watch glass.

Make a paste of it with concentrated hydrochloric acid.

Take the paste on a platinum loop.

Introduce the loop into non-luminous flame.

Observe color of the flame:

Green

Repeat the experiment with strontium chloride.

Observe color of the flame:

Crimson red

Answer 2

Apple Green color flame is observed.

• Cupric Chloride on heating with Conc.HCl gives us a green flame.
• Strontium Chloride on heating with Conc. HCl gives us a red flame.
• Cupric Chloride+Strontium Chloride together on heating with Conc.HCl gives us an apple green color.
• Concentrated HCl is used in the reaction to speed up the reaction while the salt mixture is under heating.