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Conservation of mass - Chemical Reaction(dup)

Minor Versionm

by Manikandan S

Introduction

Law of conservation of mass states that mass can neither be created nor be destroyed but, can be changed from one state to another.

    • Acid and Salt reaction

    • Chemicals used can harmful for health if ingested.

    • Wash hands propely after handling the chemicals.

  1. Place a piece of paper on weighing scale and make sure to tare weight i.e., make reading of the scale zero. Weigh 1 gm of citric acid and  transfer it to a plastic bottle. Weigh 1 gm of citric acid and  transfer it to a plastic bottle.
    • Place a piece of paper on weighing scale and make sure to tare weight i.e., make reading of the scale zero.

    • Weigh 1 gm of citric acid and transfer it to a plastic bottle.

  2. Add 17 ml of water (measure using test tube) to the water bottle and mix it thoroughly till the acid dissolves. Add 17 ml of water (measure using test tube) to the water bottle and mix it thoroughly till the acid dissolves.
    • Add 17 ml of water (measure using test tube) to the water bottle and mix it thoroughly till the acid dissolves.

  3. Add few drops of bromothymol blue to the citric acid solution. Add few drops of bromothymol blue to the citric acid solution. Add few drops of bromothymol blue to the citric acid solution.
    • Add few drops of bromothymol blue to the citric acid solution.

  4. Weigh  2.15 gm of sodium bicarbonate on a tissue paper. Fold the tissue in such a way that the sodium bicarbonate does not fall out. Fold the tissue in such a way that the sodium bicarbonate does not fall out.
    • Weigh 2.15 gm of sodium bicarbonate on a tissue paper.

    • Fold the tissue in such a way that the sodium bicarbonate does not fall out.

  5. Stretch  the rubber band and apply it on the water bottle  mouth. Now insert the sodium bicarbonate folded in tissue paper  into the mouth of the bottle and  keep the excess tissue paper outside the mouth as shown in the picture. Close the cap and make sure that  sodium bicarbonate folded in tissue paper remains at the mouth of the bottle.
    • Stretch the rubber band and apply it on the water bottle mouth.

    • Now insert the sodium bicarbonate folded in tissue paper into the mouth of the bottle and keep the excess tissue paper outside the mouth as shown in the picture.

    • Close the cap and make sure that sodium bicarbonate folded in tissue paper remains at the mouth of the bottle.

  6. Weigh the bottle before initiating the reaction. Now, shake the bottle to initiate the reaction. Now, shake the bottle to initiate the reaction.
    • Weigh the bottle before initiating the reaction.

    • Now, shake the bottle to initiate the reaction.

  7. Weigh the bottle once the solution turns bluish green Now carefully open the bottle and  weigh the bottle after the gas gets released. Now carefully open the bottle and  weigh the bottle after the gas gets released.
    • Weigh the bottle once the solution turns bluish green

    • Now carefully open the bottle and weigh the bottle after the gas gets released.

    • Sodium bicarbonate does not mix with acidic solution properly. Make sure that sodium bicarbonate is folded in single layer of tissue.

    • Gas leaking out from the bottle. Make sure the cap is air tight and check if there holes anywhere on the bottle.

Finish Line

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Manikandan S

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