Question

Lab Report Assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.

Exercise 1: Qualitative Anion Tests

Data Table 1. Anion Confirmation Tests.

Chemical	Anion	Addition of AgNO3	Addition of HCl
NaBr	Bromide	It became white and cloudy	Still was white and cloudy
Na2CO3	Carbonate	Clear inside white and cloudy around the outside	Still white and cloudy but bubbles start to form
NaCl	Chloride	Turn white cloudy on bottom clear on top	Still white cloudy on bottom clear on top
NaI	Iodide	In the middle very dark and cloudy fades out lighter white around the middle	Became a little separate
Na2SO4	Sulfate	Clear	Became white and cloudy
Na2S	Sulfide	Turn a brown color in the middle but separated from the clear	The brown becomes more separate from the clear
Unknown #103	CO3^2-	White and cloudy Small particles	Bubbles form white and cloudy
Unknown #104	S^2-	Turn brown color I the middle around clear	Some of the brown disappeared and become separate

Flow chart:

Solution containing: Br-, CO3^2-, Cl-, I-, SO4^2-, and S^2-

{AgBr(cloudy), Ag2CO3(cloudy), AglCloudy),Agl(very dark), Ag2S-(brown)} {So4^2-}

{AgBr(cloudy), AgCl(cloudy), Agl(very cloudy), Ag2S(brown)} {CO3^2-(decomposes to give CO2 gas)}

Data Table 2. Cation Flame Tests.

Chemical	Cation	Flame Observations
KI	Potassium	LIGHT PINK
CaCl2	Calcium	RED
LiOH	Lithium	FUSHA PINK
NaCl	Sodium	ORANGE
Cu(NO3)2	Copper	TEAL
Unknown #105		TEAL
Unknown #106		LIGHT PINK
Unknown #107		RED

Data Table 3. Complete Chemical Identification.

Chemical	Cation	Anion Test Observations	Anion	Complete Chemical Name and Formula
Unknown #105
Unknown #106
Unknown #107