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1.2

Minor Versionm

by Procheta Mallik

Introduction

Chemical explosions come in various forms. Here is one that is safe and can be done in your kitchen!

Tools

Video Overview

    • Avoid contact with the citric acid.

    • Do not ingest any materials.

    • Pour the cooking soda with care.

    • Handle paper cutters/scissors with care

  1. Cut the water bottle 3/4th of the way up  using a cutter/scissor. Attach the balloon to the mouth of the bottle carefully. Pour the cooking soda (3-4 g) into the balloon using the water bottle funnel (folding a paper into a funnel-like shape)
    • Cut the water bottle 3/4th of the way up using a cutter/scissor.

    • Attach the balloon to the mouth of the bottle carefully.

    • Pour the cooking soda (3-4 g) into the balloon using the water bottle funnel (folding a paper into a funnel-like shape)

  2. Pour approximately 30-50 ml of  water into a plastic bottle. Transfer  citric acid crystals (3-4g)  into the plastic bottle. Make sure that the citric acid crystals dissolve properly, which can be achieved by shaking the bottle.
    • Pour approximately 30-50 ml of water into a plastic bottle.

    • Transfer citric acid crystals (3-4g) into the plastic bottle.

    • Make sure that the citric acid crystals dissolve properly, which can be achieved by shaking the bottle.

  3. Carefully fit the balloon over the bottle opening (be careful not to drop the cooking soda into the citric acid yet).
    • Carefully fit the balloon over the bottle opening (be careful not to drop the cooking soda into the citric acid yet).

  4. Once the balloon is fitted snugly on the nozzle, hold up the balloon and allow the cooking soda to fall into the citric acid.
    • Once the balloon is fitted snugly on the nozzle, hold up the balloon and allow the cooking soda to fall into the citric acid.

    • Observe the chemical reaction and effect on the balloon

  5. Take two containers Make a hole each, on the caps of the two containers using scissors, such that the straws remain fixed firmly.
    • Take two containers

    • Make a hole each, on the caps of the two containers using scissors, such that the straws remain fixed firmly.

    • Connect the two caps using a straw through the holes. Tighten the caps on the containers. Your apparatus is ready as shown in the figure.

    • Take Lime (CaO) powder, say about 15-20g, in a small container. Add about 30ml of water, and mix thoroughly. Filter the solution using a filter paper, to get the lime water.

    • Make sure the filtrate is clear, if not, filter it again.

  6. In one of the containers, add the previously prepared lime water and close the cap. In the next container, add Vinegar/HCl first, and then add the baking/cooking soda. Quickly cover up with the lid. Quickly cover  the lid such that, the gases produced can go from this container to the other one with lime-water
    • In one of the containers, add the previously prepared lime water and close the cap.

    • In the next container, add Vinegar/HCl first, and then add the baking/cooking soda. Quickly cover up with the lid.

    • Quickly cover the lid such that, the gases produced can go from this container to the other one with lime-water

    • Observe how the gas produced in the second container causes the clear lime-water to become milky!

    • Make sure the balloon is air-tight on the bottle.

    • Make sure the quantity of citric acid crystals is sufficient

    • Make sure that you take enough baking/cooking soda to produce enough gas.

  7. How long does the balloon take to inflate? Measure the time. Can you estimate its volume? See the pictures The circumference of the sphere, is 2 pi times the radius, the value of pi = 3.14.  Hence the radius can be found,  from this find the volume Reduce the amount of cooking soda by half. Note down the time of inflation, the radius and the volume of the full balloon.
    • How long does the balloon take to inflate? Measure the time. Can you estimate its volume? See the pictures

    • The circumference of the sphere, is 2 pi times the radius, the value of pi = 3.14. Hence the radius can be found, from this find the volume

    • Reduce the amount of cooking soda by half. Note down the time of inflation, the radius and the volume of the full balloon.

    • Reduce the concentration of citric acid by half, see the un-reacted baking soda at the bottom of the container. Compare it with the original concentration. Use the table mentioned here

    • Write the reaction in words.

    • Note that cooking soda is sodium bicarbonate (NaHCO3)

    • The reaction results here in (One correct answer) a. Warmer (liquid + container) b. Colder (Liquid + container) c. Stays the same.

  8. Vary the Acid first, and see the response.
    • Vary the Acid first, and see the response.

    • Vary the Base (Baking/cooking soda here), and note the response

    • To learn more about the variations for this tactivity, please refer to the Variations guide by Clicking here.

Finish Line

Vishal Bhatt

Member since: 04/26/2017

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