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Conditions That Speed Up or Slow Down the Dissolving Process

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by

Christina Philip

on 20 September 2014

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Transcript of Conditions That Speed Up or Slow Down the Dissolving Process


Do you prefer your iced tea sweetened with sugar? Sweetened iced tea is a solution. The solid sugar (the solute) is dissolved in cold liquid tea. The liquid tea is mostly water (the solvent). What do you think happens when you add sugar to tea? Particles of water pull apart particles of sugar. The particles of sugar spread throughout the tea. This is what makes the tea taste so good.
Did you ever drink the tea before all the sugar has dissolved? Did you ever notice that some of the sugar is sitting on the bottom of the container?

Q: What could you do to dissolve the sugar faster?
Stirring
Stirring a solute into a solvent speeds up the rate of dissolving. This is because it helps distribute the particles throughout the solvent. For example, when you add sugar to iced tea and then stir the tea, the sugar will dissolve faster. What if you don’t stir the tea, will the sugar still dissolve? It may eventually dissolve, but it will take much longer. You can think of stirring like adding energy to the process.
Summary
• The rate of dissolving of a solute in a solvent is faster when the solute and solvent are stirred
• The rate of dissolving of a solute in a solvent the solvent is warmer,
• The rate of dissolving is affected if the solute consists of smaller particles with more surface area.

Temperature
The temperature of the solvent is another factor. Temperature affects how fast a solute dissolves. Generally, a solute dissolves faster in a warmer solvent. It dissolves more slowly in a cooler solvent. What happens when you add the same amount of sugar to cups of hot and cold tea?
Particle Size
There is another factor that affects the rate of dissolving. The particle size of solute particles affects the rate. Smaller particles have greater surface area. Think of a large block of Legos. When all the blocks are stuck together you can measure their surface area. Now take all the blocks apart and measure their individual surface areas. Which has more?
Conditions That Speed Up or Slow Down the Dissolving Process!
What Dissolves in Water?
ANSWER!
The rate of dissolving is caused by several factors.
These factors include
stirring
temperature
and the size of the particles
Greater surface area provides more contact between the particles the solvent. For example, if you put granulated sugar in a glass of iced tea, it will dissolve more quickly. If you put a sugar cube in a glass of iced tea it will dissolve more slowly. That’s because all those tiny particles of granulated sugar have greater surface area than a single sugar cube.
Answer in your Science Spirals
1. List three factors that affect the rate at which a solute dissolves in a solvent.

2. Gina is trying to dissolve bath salts in her bathwater. How could she speed up the rate of dissolving?
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