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Reaction of Sodium and Water

Reaction of Sodium and Water. When sodium reacts with water hydrogen gas and sodium hydroxide are produced . Purpose. To observe the reactivity of a metal with water. Demonstration. Only a tiny piece of sodium was used

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Reaction of Sodium and Water

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  1. Reaction of Sodium and Water When sodium reacts with water hydrogen gas and sodium hydroxide are produced

  2. Purpose • To observe the reactivity of a metal with water

  3. Demonstration • Only a tiny piece of sodium was used • since the reaction is exothermic and also produces hydrogen gas, too much heat would cause the hydrogen to explode • 2H2 + O2 2H2O • As the metal reacted, it hissed on a cushion of hydrogen gas • The sodium hydroxide produced caused the indicator to turn pink

  4. Concepts 1. Metals 2. Bases 3. Reactions of Metals

  5. 1. Metals • Most of the elements of the Periodic Table are metals • Metals have common properties • shiny • maleable • ductile • electrically conductive • Some metals are more reactive than others • Group IA metals are the most reactive

  6. 2. Bases • A base is a substance that produces hydroxide ion when dissolved in water • Common bases are hydroxides of Group IA and Group IIA metals LiOH lithium hydroxide NaOH sodium hydroxide KOH potassium hydroxide Mg(OH)2 magnesium hydroxide Ca(OH)2 calcium hydroxide

  7. 3. Reactions of Metals • Metals commonly react with acids • Metals of Group IA react with the very weak acid, water Metal + H2O Metal hydroxide + H2 • Reaction of a Group IA metal with water gives a metal hydroxide and hydrogen gas

  8. Conclusions • Sodium was more reactive than other Group II metals • Sodium was so reactive that it reacted with water • Group IA metals such as sodium are the most reactive metals • When Group IA metals reacted with water hydrogen gas was produced in addition to a metal hydroxide

  9. Comments • This demonstration is an example of a redox reaction which is a double replacement reaction Na + H-OH NaOH + H2 • sodium metal has oxidation number of zero but ends up as 1+ • hydrogen in water has oxidation number of 1+ but ends up as zero in hydrogen gas • Magnesium is a Group IIA metal that will not react with water but will react with acids

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