Safe Video Demonstration Sodium and Potassium Exploding in Water

Introduction: Safe Video Demonstration Sodium and Potassium Exploding in Water

The demonstrations of many remarkable experiments include a high safety risk (e.g. the reaction of large pieces of sodium/potassium with water; the reaction of potassium with liquid bromine; the reaction of sodium with concentrated sulfuric acid, etc.). Chemistry teachers and instructors are usually reluctant to perform experiments that include a hazard. As a result, a number of fascinating experiments remain unknown to the public.

A very violent reaction of sodium and then potassium with water.
2Na + 2H2O --> 2NaOH + H2

2K + 2H2O -->2KOH + H2

Small pieces of these metals are dropped in water.

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    24 Comments

    0
    fd93
    fd93

    13 years ago on Introduction

    we also did that but we used some other alkilane that i cant remember. i think ribidium or cesium it was realy ausome.

    0
    Tubetech762
    Tubetech762

    Reply 12 years ago on Introduction

    Try lithium if you can get any. It isn't radioactive like cesium and the reaction is quite entertaining. Lithium is VERY reactive and when contact with water the reaction is explosive so be VERY carefull

    0
    samuelx3
    samuelx3

    Reply 1 year ago

    ceusium isn't radioactive i think.

    0
    fd93
    fd93

    Reply 12 years ago on Introduction

    if you have lithium my fave is to use it in fireworks makes great deep reds

    0
    Tubetech762
    Tubetech762

    Reply 12 years ago on Introduction

    I was reffering to metallic lithium but in this form it is hard to find, as few people are experianced enough to handle it safely. But you are correct lithium makes a beautiful red

    0
    Holden_vy_s
    Holden_vy_s

    Reply 12 years ago on Introduction

    I HIGHLY doubt you used Rubidium. And i doubt you used Caesium either, they were most likely Sodium or Potassium.

    0
    fd93
    fd93

    Reply 12 years ago on Introduction

    ya i have since checked with my teacher it was like 5 grams of potassium

    0
    heavy.metal.nguyen
    heavy.metal.nguyen

    Reply 13 years ago on Introduction

    I doubt you used rubidium in a school science experiment. Alkali metals react very violently when it reacts with water.

    0
    antienoob
    antienoob

    12 years ago on Introduction

    is this video also on youtube because my computer is playing up and i cant view it.

    0
    codongolev
    codongolev

    13 years ago on Introduction

    did anyone notice that the potassium made the water green, but then it exploded and turned purple?

    0
    lobo_pal
    lobo_pal

    Reply 12 years ago on Introduction

    That was a Ph indicator. It turned purple because of the presence of NaOH in the water after the reaction.

    0
    high1
    high1

    Reply 13 years ago on Introduction

    yeah, I did, it is strange...

    0
    adsa
    adsa

    12 years ago on Introduction

    As an alternative fill a beaker with water to create a positive meniscus. Add 2-3 drops of phenolphthalein to the water and then place a piece of filter paper on the beaker ensuring the paper absorbs some of the water. Place some Na onto the paper, stand back and enjoy. Unfortunately my school is not allowed to have K or Na anymore, so keep your videos coming!!!

    0
    codongolev
    codongolev

    12 years ago on Introduction

    just shake to combine the potassium with the water, draw while you still can, then run and hope it doesn't blow up! if it doesn't, then keep drawing in purple. if it does, then hey! abstract art.

    0
    mr.space
    mr.space

    Reply 12 years ago on Introduction

    that probably universal indicator solution, green is neutral, the purple indicates a strong alkali solution i.e. potassium hydroxide

    0
    FunkNattidelic

    I noticed that the thing that the crap was put in was green before the explosion and purple after the explosion. any body else notice that??

    0
    Scar21
    Scar21

    Reply 13 years ago on Introduction

    Yeah, you can even see the color change when it goes to slow motion. And the thing the crap was put into was water. And the crap is Potassium. We did this at our school, but with sodium instead. It caught fire, but not actually exploding like that :D

    0
    conrad2468
    conrad2468

    Reply 13 years ago on Introduction

    go to unitednuclear.com to get some sodium and other reactive elements plus other junk that you might want