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Hydrogen production
Chimica

Hydrogen production

To demonstrate the displacement of hydrogen from hydrochloric acid by the use of zinc.

Preparazione e analisi dei gas
hydrogen; gas preparation; metal and acid

Cosa imparano gli studenti

La scienza alla base di questo esperimento

Hydrogen is the lightest and most abundant element in the universe. This experiment demonstrates a convenient method of obtaining hydrogen from hydrochloric acid.

Attrezzatura utilizzata

  • Iron stand — 5404.52
  • Universal clamp — 5416.20
  • Right angle clamp — 5401.16
  • Conical flask 150 ml — 1322.10
  • Rubber stopper, 2 holes — 5450.80
  • Dropping funnel — 1359.00
  • Right angle bent glass delivery tube — 1468.07
  • Connection for glass delivery tubes — 5449.43
  • Dropping pipette — 1441.50
  • Beaker 100 ml — 1118.20
  • Spatola — 5460.34
  • Parafilm — 1646.00

Sostanze chimiche e reagenti

  • Hydrochloric acid 2 M — R:34-37 S:26-45
  • Granulated zinc
  • Acqua distillata

Note sulla sicurezza

  • Hydrogen is a very flammable gas and forms explosive mixtures with air. It is essential that naked flames are kept well away from the apparatus.

Domande per gli studenti

  • Describe what has happened and state the reaction.

Cosa aspettarsi

<p>On adding the hydrochloric acid solution, bubbles arise from the granulated zinc and the gas displaces the air inside the conical flask.</p><p>The hydrochloric acid reacts with zinc giving zinc chloride and hydrogen. 2HCl + Zn → ZnCl2 + H2 ↑ (g).</p><p>Bubbling into the beaker indicates the gas production.</p>

Smaltimento

After the experiment the reaction can be halted by adding 100–150 ml of water to the conical flask. The liquid can then be disposed of in the liquid wastes container.

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