How can the presence of nickel in various samples of chocolates be detected?

Answer 1

Take a small piece of the chocolate and crush it into fine powder. Put it into a test tube and add a little hydrochloric acid .

Add some water and boil it till the chocolate melts to form a solution.

To the solutions obtained, add ammonium chloride and ammonium hydroxide.

Now take a little amount of the solution and pass hydrogen sulphide gas through it using kipp's apparatus . Formation of a black colour indicates the presence of group four cations.

Now to the filtrate, add small amount of dimethyl glyxime. If a rose red coloured precipitate is obtained in a scarlet red solution, then presence of Nickel (Ni2+) is confirmed.

Answer 2

v Take a small piece of the chocolate and crush it into fine powder. Put it into a test tube and add a little hydrochloric acid .

v Add some water and boil it till the chocolate melts to form a solution.

v To the solutions obtained, add ammonium chloride and ammonium hydroxide.

v Now take a little amount of the solution and pass hydrogen sulphide gas through it using kipp's apparatus . Formation of a black colour indicates the presence of group four cations.

v Now to the filtrate, add small amount of dimethyl glyxime. If a rose red coloured precipitate is obtained in a scarlet red solution, then presence of Nickel (Ni2+) is confirmed.

By sameer

Answer 3

Nickel in chocolates can be detected using analytical techniques such as atomic absorption spectroscopy, inductively coupled plasma mass spectrometry, or X-ray fluorescence spectroscopy. These methods can accurately measure the concentration of nickel in the samples to ensure compliance with safety regulations.

Answer 4

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