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ID number:729385
 
Evaluation:
Published: 20.04.2007.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Kālija alauns jeb kālija-alumīnija sulfāts

K2SO4 + Al2(SO4)3 ∙18H2O + 6 H2O → 2KAl(SO4)2∙12H2O


Darba gaita.

12,5(18,76mmol) gramus Al2(SO4)3 ∙18H2O izšķīdināja 40ml ūdens un nofiltrēja. Atsevišķi sagatavo 3,75 gramus (21,59mmol) K2SO4 šķīdumu 25ml ūdens. Šķīdumus apvieno un ietvaicē ūdens pirtī līdz kristāliskas plēvītes parādīšanos uz virsmas. Šķīdumu nepārtraukti maisot atdzesē līdz istabas temperatūrai. Izveidojušos kristālus izšķīdina minimālā daudzumā verdoša ūdens un nofiltrē. Atdzesē šķīdumu līdz istabas temperatūrai. Izveidojas bezkrāsaini kristāli.…

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