writing a lab report. scientific method when performing a lab experiment we follow the scientific...

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Writing a Lab Report

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Page 1: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Writing a Lab Report

Page 2: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Scientific Method

When performing a lab experiment we follow the scientific method.

What is the scientific method?

Purpose, Hypothesis, Procedure, Results, Conclusion.

Page 3: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Purpose

What is the purpose?

The purpose is why you are performing the experiment.

The purpose of this experiment is to determine a set of solubility rules and to determine when a precipitate will be formed by combining cations and anions together.

Page 4: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Hypothesis

An educated guess about what will happen in the experiment.

In this experiment, it is hypothesized that a displacement reaction will occur when two ionic solutions are mixed together. This displacement reaction will result in the formation of a precipitate.

Page 5: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Materials

In this section all of the materials are listed in DETAIL.

12x 250 ml beaker12x 50 ml graduated clyinder50 ml of OH-

(aq) solution50 ml of Na+

(aq) solution

Page 6: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Procedure

In this section you provide a step-by-step, detailed account of how to perform the lab.

Remember, the idea behind a lab report is to be able to recreate the experiment.

Page 7: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Procedure

1. Carefully pour 25ml of OH- (aq) solution

into a clean 50 ml graduated cylinder. 2. Carefully pour 25ml of Na+

(aq) solution into a clean 50 ml graduated cylinder.

3. Pour the 25 ml of OH- (aq) solution from the

graduated cylinder into a clean 250ml beaker.

4. Add the 25ml Na+ (aq) solution to 25ml OH-

(aq) solution in the 250ml beaker.

Page 8: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Repeat procedure for each of the reactions as follows:

Ag+ (aq) + Cl- (aq)

Page 9: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Data Collected

The following data was collected and organized in the following table.

Let N.R. represent “no reaction” to indicate that there was no precipitate observed.

Let PPT. represent “precipitate” to indicate that a precipitate was observed.

Page 10: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Results and Discussion

It was observed that a displacement reaction occurred when a cation was mixed with an anion.

However, a precipitate did not form for each reaction.

This can be explained by the properties of solubility.

Page 11: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Results and Discussion

Some of the ions mixed are soluble with one another and will continue to exist in an aqueous solution.

Some ions are insoluble when mixed together and thus will form a solid, or a precipitate, in the beaker.

The solubility of an ion can be determined by determining solubility rules or by using a solubility chart to predict the reaction.

Page 12: Writing a Lab Report. Scientific Method When performing a lab experiment we follow the scientific method. What is the scientific method? Purpose, Hypothesis,

Conclusion

In conclusion, the original hypothesis was not entirely correct. When cations are combined with anions a displacement reaction will occur. The result of the displacement reaction will depend on the solubility of each of the ions. Some ions are insoluble when combined with another specific ion, when these two ions combine they will form a precipitate. Other ions are soluble when combined and will not form a precipitate, but rather will continue to exist in an aqueous solution.