Escience: Qualitative Analysis Of Ions

Question # 00793605 Posted By: 175 Updated on: 02/10/2021 12:21 PM Due on: 02/24/2021
Subject Chemistry Topic General Chemistry Tutorials:
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pre-lab Questions

1. What is one difference between qualitative and quantitative analysis? 

Answer. Qualitative and quantitative analysis differ in that qualitative analysis is based on the properties and attributes of an item while quantitative analysis is based on computable values of an item or individual. 

2. Use Table 1 to determine which metal ion would be identified as the reactant if a reaction with ammonia produces a violet complex? Use scientific reasoning to explain your answer. 

Answer. The metal ion is Nickel ion. This is because the reaction between nickel ion and ammonia produces a violet color of transition of nickel complex.

3. Use the pH scale to describe an acidic solution and a basic solution. At what pH would a solution be considered neutral? Why? 

Answer. An acidic solution has a PH of below 7 in a PH scale while a basic solution i has a PH above 7. A neutral solution has a PH of 7. This is because at a PH of 7, a solution cannot be regarded as either acidic or basic. 


experiment 1: qualitative analysis of reactions

Data Sheet

Table 2: Litmus Test Results of OH- and H+


Solution Type


Initial Litmus Color


Final Litmus Color


Acid or Base?


Acetic acid 








Sodium bicarbonate 







Table 3: Test Results


Solution Type










Carbonate Ion


Bubble formation when an acid is added 


Clear solution 




Sulfate Ion


White precipitates when barium chloride is added to the   solution. 


Clear solution 


White precipitates 


Phosphate Ion


Formation of white precipitate 


Clear solution


White precipitate formed 


Calcium Ion


Formation of precipitate 


Clear solution 



Table 4: Determination of an Unknown Results



Carbonate Ion Test Tube


Sulfate Ion Test Tube


Phosphate Ion Test Tube




No bubbles observed. Solution remained clear 


No precipitate 


White precipitate formed


Result: Positive or Negative?







Post-Lab Questions

1. What ion is contained in the unknown solution? Use your results as evidence. 

2. Imagine that the unknown solution contains aqueous ammonium sulfate, which is commonly used in fertilizer. Write a balanced equation for the precipitation of barium sulfate after mixing aqueous ammonium sulfate and barium chloride.

3.  Identify and discuss any sources of error for this experiment. How could you mitigate error?

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