Ms. Apanasenko by Natalia Apanasenko

How do we calculate the solubility?

natalia_apanasenko — 2016-05-12 00:56:52 UTC

We have learnt from the experiment, that the solubility of sugar increased with the temperature. But how can we calculate solubility?

Solubility= mass of solute / volume of solvent

So, we can say that solubility of sugar in tea (water) at 20 °C is 204 grams per 100 cm3 of water.

If we have measured the mass of the sugar added to water, and the temperature of the water we would receive the following table showing the solubility of sugar at different temperatures.

HOW CAN WE USE THIS DATA...?

natalia_apanasenko — 2016-05-12 01:20:43 UTC

natalia_apanasenko — 2016-05-13 02:25:24 UTC

natalia_apanasenko — 2016-05-13 02:26:06 UTC

natalia_apanasenko — 2016-05-13 02:26:48 UTC

natalia_apanasenko — 2016-05-13 02:30:16 UTC

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natalia_apanasenko — 2016-05-13 02:31:10 UTC

To plot solubility graphs!

natalia_apanasenko — 2016-05-13 02:37:31 UTC

Solubility curves are a graphical representation of the solubility of a certain salt over a temperature range.
This curve was created using data from the table.

How can we use solubility curves?

natalia_apanasenko — 2016-05-13 02:47:34 UTC

Watch a video explaing solubility curves and their interpritation

For step-by-step instructions on how to draw line graphs click on the licks below

natalia_apanasenko — 2016-05-13 02:50:56 UTC

Now, each of you will practice calculating the solubility and plotting the solubility curve. You will need to write your date and the number of the task in your workbook. You will then choose and complete one of the three tasks on solubility below.

natalia_apanasenko — 2016-05-13 02:53:07 UTC

All calculations must be recorded in your workbooks.

The process where a solid becomes part of a liquid is called … dissolving.

natalia_apanasenko — 2016-05-13 03:03:06 UTC

A liquid that has a solid dissolved in it is called a …solution.

natalia_apanasenko — 2016-05-13 03:03:34 UTC

A liquid in which a solid will dissolve is called a … solvent.

natalia_apanasenko — 2016-05-13 03:03:44 UTC

The name given to a substance dissolved in a liquid is a …solute.

natalia_apanasenko — 2016-05-13 03:03:55 UTC

When a solid dissolves in water it is said to be … soluble.

natalia_apanasenko — 2016-05-13 03:04:06 UTC

The property of a material describing how well it will dissolve in a liquid is ... solubility.

natalia_apanasenko — 2016-05-13 03:04:15 UTC

CALCULATING SOLUBILITY

natalia_apanasenko — 2016-05-13 03:10:00 UTC

During the lesson, we have investigated the how temperature influenced the solubility of sugar in water. Now we will:
-learn how to calculate the solubility
-plot the line graph
-make sense of the graph

Solubility tasks

natalia_apanasenko — 2016-05-13 10:55:39 UTC

The dependent variable is your result.

natalia_apanasenko — 2016-05-14 02:24:02 UTC

The independent variable is the factor that we change during an investigation.

natalia_apanasenko — 2016-05-14 02:26:35 UTC

The controlled variables are what you must keep the same in order to maintain a fair test.

natalia_apanasenko — 2016-05-14 02:27:31 UTC

How to draw a line graph

natalia_apanasenko — 2016-05-14 02:28:49 UTC

When plotting the line on the lined paper always remember:

1. Use a sharp pencil

2. Use a ruler

3. Draw two axes (across = horizontal, up = vertical) - try to make the graph as big as possible.

4. Chose the correct type of graph. Bar graph for grouped data or line graph for continuous data.

5. Choose a sensible scale for both axes. Remember each square should be the same number.

6. Label the axes e.g. Temperature, height, weight, speed.

7. Add the units to the axes label e.g. (°C), (cm), (Kg), (m/s)

8. Plot the data onto the graph

9. Add a title, you can use the heading of the x & y axes to help. Eg ‘A graph to show….’

10. Underline the title