"Chemical Teleport" experiment

Sublimation of iodine

Sub­li­ma­tion is the tran­si­tion from a sol­id to a gas phase, with­out pass­ing through a liq­uid phase. This ex­per­i­ment is im­pres­sive be­cause from un­re­mark­able black gran­ules of io­dine, a beau­ti­ful vi­o­let cloud is formed, which grad­u­al­ly dis­ap­pears on cool­ing.

Reagents and equip­ment:

  • crys­tal io­dine;
  • heat-re­sis­tant beaker;
  • round-bot­tomed flask;
  • ice;
  • hot plate.

Step-by-step in­struc­tions

Place a few grams of crys­tal io­dine in the beaker and cov­er it with the flask con­tain­ing ice. Place the beaker on the hot plate or oth­er heat­ing de­vice. Turn on the heat. Ob­serve io­dine va­por ap­pear, which set­tles on the flask.

Pro­cess­es de­scrip­tion

On heat­ing, io­dine does not melt, but im­me­di­ate­ly moves to a gas phase, i.e. it sub­limes. The io­dine va­por formed ris­es,set­tling on the cold flask and form­ing crys­tal io­dine. This process is called desub­li­ma­tion. This prop­er­ty of io­dine is used for re­mov­ing var­i­ous im­pu­ri­ties from it.

Safe­ty pre­cau­tions

Wear pro­tec­tive gloves and con­duct the ex­per­i­ment in a well-ven­ti­lat­ed room. Ob­serve safe­ty rules when work­ing with elec­tri­cal de­vices.

Warn­ing! Sub­stances of this ex­per­i­ment are tox­ic and high­ly dan­ger­ous for your health. Do not try this at home. Only un­der pro­fes­sion­al su­per­vi­sion.