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1.1

Minor Versionm

by Procheta Mallik

Introduction

We test and measure the solubility of sugar and salt in water, separately, at different temperatures

    • Adult supervision is recommended while heating.

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  1. Fill the given Test Tube with water up to the brim .
    • Fill the given Test Tube with water up to the brim .

    • Take an empty container and transfer water from test tube in that, as shown in image .

    • The test tube has a volume of 13 ml. Pouring it four times will give you 52 ml of water.

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    • You can also use a volume beaker if you have one.

    • Take the given pen cap and fill it up to the brim with salt as shown in image. This salt would weigh around 2 g.

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    • Transfer salt (collected in pen cap) to the ~50 ml water .

    • Stir it well. Keep adding salt till it cannot dissolve any further.

    • The number of times you have transferred salt would give you the solubility of salt in 50 ml of water at room temperature. Note that you transfer around 2 g salt through one full pen cap.

    • Record the value in given table.

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    • Heat the salt water on bunsen burner or cooking gas.

    • Continue to dissolve more salt.

    • A point will come where you will see the undissolved salt particles in water. Keep count of the number of pen caps of salt transferred till this point. This will give you the solubility of salt in 50 ml of hot water.

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    • Fill the given Test Tube with water up to the brim.

    • Take an empty container and transfer water from test tube in that, as shown in image.

    • The test tube has a volume of 13 ml. Pouring it four times will give you 52 ml of water.

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    • Fill the pen cap with sugar up to the brim and transfer in a bottle cap. The sugar in one full pen cap would weigh around 2 g.

    • Do this till the bottle cap is full.

      • Count the number of pen cap rounds you took to fill the bottle cap. If you took 4 rounds, it implies that the bottle cap contains sugar which weighs around 8 g.

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    • Transfer sugar to the 50 ml water and mix it well.

    • Continue to add more sugar till it stops dissolving further. You will observe the undissolved sugar particles as shown in image.

    • The number of times you added sugar(using bottle cap) would give you the solubility of sugar in 50 ml of water at room temperature.

      • For eg: if you dissolved 12 bottle caps of sugar and each cap weighed 8 g of sugar then it implies solubility of 96 g at room temperature.

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    • Now heat the sugar water on bunsen burner (or cooking gas) till it starts boiling.

    • Continue to add more sugar and keep mixing it till it stops dissolving any further. Keep count of the number of bottle caps of sugar you poured.

      • The above will give you the solubility of sugar in boiling water (100 degree celcius).

    • Record the solubility value in the given observation table.

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    • Record your observations in the given table .

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    • Stir well and observe closely if the salt/sugar is getting dissolved.

    • Write and make note of the number of caps of salt/sugar each time you add one. Making detailed and written records is an integral part of scientific process.

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    • What is the volume of water before you add salt and after? Observe this for both cases - with heating and without.

    • What is the volume of water before you add sugar and after? Observe this for both cases - with heating and without.

      • Can you deduce the density of sugar from this data?

    • Something to ponder - is dissolving of salt/sugar in water a physical change or chemical change?

      • What exactly happens when the salt/sugar dissolves in water?

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Finish Line

Vishal Bhatt

Member since: 04/26/2017

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