Item 1
At Arua Secondary school during a chemistry practical lesson, students were investigating the nature of solutions obtained from different fertilizers used by the residents of Ocolini village by identifying their pH values. The residents had complained about poor crop yields of their crops yet they had some fertilizers constantly. The results obtained were recorded in the table shown below.
Task
Classify the fertilizers solutions above depending on their nature.
- Nature of W
- Nature of X
- Nature of V
- Nature of Y
- Nature of Z
Name the anions that determine the pH values of fertilizers of X and Y
- X
- Y
During an investigation. sodium carbonate was added to solutions X and Z. The students observed that solution X liberated more effervescence than solution Z. As a chemistry student, explain this observation (include equation for the reaction).
Discuss the reactions of the following substances with dilutes acids (hydrochloric acid) and write the equations of the reactions.
- Magnesium metal
- Copper (II) oxide
- Calcium carbonate
- Copper metal
Item 2
The Chemistry club at Muni University has received two solutions, A and B with their behaviors on litmus solutions. As a chemistry student, you must categorize these solutions as acidic, basic or neutral.
Solution A
- Turns blue litmus solution red
- No observable change
Solution B
- Turns red litmus solution blue
- No observation change
Task
- Categorize solutions A and B as acidic, basic or neutral based on their behavior on litmus papers.
- Suggest examples of substances that behave the same way as solutions A and B.
- What are the applications of these substances on everyday life.
- Name the type of reaction that occurs between A and B
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