Activity 2: Temperature Effects

Introduction

In this laboratory activity you will study two chemical systems and observe the effect of temperature changes on them: (1) the aqueous ammonia system and (2) the Fe 3+ /SCN ­ system first studied in Laboratory Activity 1 .

Purpose

To determine the effect of temperature on chemical systems.

Safety

1. Wear protective goggles throughout the laboratory activity.

2. CAUTION: The test-tube will be hot after heating. Be sure to use a test-tube holder.

3. Concentrated ammonia solution has a strong odor. Avoid breathing the ammonia fumes. Be careful not to spill any concentrated ammonia solution on yourself. If you do spill any, wash the area with large amounts of water and notify your teacher.

4. Dispose of the chemicals as your teacher directs.

Part I Procedure

Data Analysis

1. Can ultraviolet light be used to distinguish the substances from one another?
2. Can iodine be used to distinguish the substances from one another?
3. Can the R f value be used to distinguish one substance from another?

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