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Salutem tibi in Communibus! Haec sunt Vicimedia Communia, in quibus 116,585,457 res ad libere utendum proponuntur	Natura Imagines	Societas Soni	Scientia Video
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Imago cottidiana

Flowering trees at the bottom of the Eiffel Tower in Paris (France). Today is the March equinox, which marks the beginning of astronomical spring in the Northern Hemisphere. +/− [la], +/− [en]

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Res selecta

Res selecta

An experiment showing burning of sulfur in oxygen. A flow-chamber joined to gas washing-bottle (filled with solution of methyl orange) is being used. The product is sulfur dioxide (SO₂) with some traces of sulfur trioxide (SO₃). The 'smoke' that exits the gas-washing bottle is, in fact, a sulfuric acid fog generated in a reaction represented by:

SO₃(g) + H₂O(l) = H₂SO₄(aq).

The oxides are acidic, as can be witnessed by the colour change of the indicator.

+/− [la], +/− [en]

Habesne difficultatem circa rem?

Priores selectae res...

Selectae imagines

Si primum in Communibus es, forte voles proficisci a selectis imaginibus quas communitas Communium ideo elegit quod optimae sunt.

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