Application :some white powder was found at the scene of robbery.
Similar-looking powder was found in the pocket of a suspect. Police need to know whether the two samples of powder are the same substance.
Aim:-the aim of this experiment is to analysis the two samples given by the police to determine the cation and the anion in both samples X which was found at the scene of the robbery and sample Y which was found in the suspected pocket .
• test tubes,
• test-tube racks,
• watch glass,
• dropping pipette,
• Nichrome wire,
• Bunsen burner,
• Heat proof mat,
• distilled water,
• concentrated hydrochloric acid,
• barium chloride solution,
• silver nitrate solution,
• two samples of white powder labelled “from the scene crime –X” and “from the pocket of the suspect-y”,
• 1.0 mol hydrochloric acid
Ammonium hydroxide( NH4OH)
Corrosive, dangerous to the environment ,very toxic to the organisms. Irritant, if swallowed cause internal damage.
Sodium hydroxide (NAOH) Corrosive, causes sever burns. Dangerous with water.
Nitric acid HNO3
Oxidising, corrosive, causes sever burns. irritant
Hydrochloric acid (HCl) Corrosive, Irritating to respiratory system.
Barium chloride (BaCl2) Toxic , harmful by inhalation ,harmful.
Silver nitrate AgNO3
dangerous to the environment, corrosive, causes burns, very toxic too organisms irritant.
Method: the flame test was very exciting, and it was easy and fast. first we tried to make Nichrome wire clean by dipping it in the acidic solution and putting it in the flame of the Bunsen burner until we got the pure original flame colour, after that we dip the nichrome wire in of the samples we started with sample X, and then we had detected for the colour that produced when the flame’s colour changed, we recorded the result and it was “Red” then we observed the other...