Chemistry Lab Report: Flame Tests for Metallic Ions
Purpose: To observe the characteristic colors produced when certain metallic ions are vaporized. Metallic Ion Color in Flame
Na+ Light Orange K+ Pink / Orange Li Red Ca2+ Dark Orange Sr2+ Red Cu2 Green Co+2 Salmon Pink Ammonium Dichlorate Orange Sparks K2CR2O7 Orange Fe+1 No Reaction NaCl Orange Strantium Chloride Scarlet Red Ni+2 Dark Orange Copper Sulfate (solid) Green Fe+2 No Reaction Sn+2 Orange Zn+ Orange LiCl Magenta KCl (solid) Smoky Purple 1. The inaccuracies that may be involved in using flame tests for identification purposes is that there are certain ions that produce the same flame color and further identification must be made to identify the substance. 2. The pairs of ions that produce similar colors are K2CR2O7 and NaCl, Sn+2 and Zn+, and Ca2+ and Ni+2. 3. A flame test is a procedure used to test qualitatively for the presence of certain metals in chemical compounds. When the compound to be studied is excited by heating it in a flame, the metal ions will begin to emit light. Based on the emission spectrum of the element, the compound will turn the flame a characteristic color. 4. A. Quanta- a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents; an analogous discrete amount of any other physical quantity, such as momentum or electric charge.
B. Ground State- the lowest energy state of an atom or other particle.
C. Excited State- a stationary state of higher energy than the lowest stationary state or ground state of a particle or system of particles.
5. A spectroscope is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. The variable measured is most often the light's intensity but could also, for instance, be
Na+ Light Orange K+ Pink / Orange Li Red Ca2+ Dark Orange Sr2+ Red Cu2 Green Co+2 Salmon Pink Ammonium Dichlorate Orange Sparks K2CR2O7 Orange Fe+1 No Reaction NaCl Orange Strantium Chloride Scarlet Red Ni+2 Dark Orange Copper Sulfate (solid) Green Fe+2 No Reaction Sn+2 Orange Zn+ Orange LiCl Magenta KCl (solid) Smoky Purple 1. The inaccuracies that may be involved in using flame tests for identification purposes is that there are certain ions that produce the same flame color and further identification must be made to identify the substance. 2. The pairs of ions that produce similar colors are K2CR2O7 and NaCl, Sn+2 and Zn+, and Ca2+ and Ni+2. 3. A flame test is a procedure used to test qualitatively for the presence of certain metals in chemical compounds. When the compound to be studied is excited by heating it in a flame, the metal ions will begin to emit light. Based on the emission spectrum of the element, the compound will turn the flame a characteristic color. 4. A. Quanta- a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents; an analogous discrete amount of any other physical quantity, such as momentum or electric charge.
B. Ground State- the lowest energy state of an atom or other particle.
C. Excited State- a stationary state of higher energy than the lowest stationary state or ground state of a particle or system of particles.
5. A spectroscope is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. The variable measured is most often the light's intensity but could also, for instance, be