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# Rate of Solution Mark as Favorite (21 Favorites)

LAB in Mixtures, Solubility, Reaction Rate, Saturated/Unsaturated/Supersaturated. Last updated October 08, 2019.

### Summary

In this lab, students observe how particle size, solvent temperature, and agitation affect rate of solution.

High school

### AP Chemistry Curriculum Framework

• Big Idea 4: Rates of chemical reactions are determined by details of the molecular collisions.
• 4.1 The student is able to design and/or interpret the results of an experiment regarding the factors (i.e., temperature, concentration, surface area) that may influence the rate of a reaction.

### Objectives

By the end of this lesson, students will

• understand factors that affect rate of solution.

### Chemistry Topics

This lesson supports students’ understanding of

• Kinetics
• Solutions
• Solubility

### Time

Teacher Preparation: 30 minutes

Lesson: 45 minutes

### Materials

• Cup
• Straw
• Variable cards (see Teacher Notes)
• Sharpie
• Ruler
• Balance
• Granulated sugar
• Sugar cubes
• Superfine sugar
• Water
• Timer
• Lemon juice
• Ice cubes

### Safety

• Food should never be consumed in a lab setting. Complete this activity in a nonlab setting.
• When finding the mass of items that are intended for consumption, make sure they do not come into contact with the balance.

### Teacher Notes

• Create variable cards by writing on index cards the types of sugar, water temperature, and stirring frequencies. Have students select one card from each pile (three cards total) to assign what variables each group will investigate.

### Prelab Questions

1. What three factors affect the rate of solution?
2. Predict which factor will have the biggest effect on the rate of solution.

### Problem

In this lab, you will produce a sweet acidic solution (aka lemonade). You will look at how different factors affect the rate of solution of sugar.

### Procedure

1. Wash your hands. Pick up a plastic cup and a straw.
2. Have each person in your group draw one set of variables. If two people have the same sets of variables, one of them should select a new card.
3. Using a Sharpie, label your cup with your combination of variables. Using the ruler and a Sharpie, draw a horizontal line 2 cm from the top lip of the cup.
4. Using a balance, measure 12 g of the appropriate sugar into your cup. If you have cube sugar and need a bit more to get 12 g, use a bit of granulated.
5. Pour the appropriate temperature water to the line on your cup.
6. Start the time for your table. If you are supposed to stir, stir with the straw. If you are supposed to leave yours still, you may stir once per minute for 3 seconds.
7. Once the sugar is all dissolved, your group should note the time and record the data. Record the times for all of your group members experiments in your data table.
9. In a new cup, draw a line 2 cm from the top lip of the cup, like you did in step three. Fill the cup to the line with water. Using a graduated cylinder, measure how much water this is. Record that volume.

### Data

Volume of water _____________________

Gather data from your classmates to complete the chart.

 Sugar Water Temperature Agitation Time to Dissolve Cube Cold Stirred Still Room Stirred Still Granulated Cold Stirred Still Room Stirred Still Superfine Cold Stirred Still Room Stirred Still

Create a bar graph of the data.

### Analysis

Write a one-page summary of what learned from this lab. Include the following: