Ushirikiano
SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Hatari
Chromium Trioxide: Zettnow's Dichromate and Sulphuric Acid Method (Thorpe, 1912)
Chromic anhydride (chromium trioxide), the crimson crystals used in chromium plating, by Zettnow's method: potassium dichromate is broken up with strong sulphuric acid, the potassium sulphate left to crystallise out, and the chromic anhydride crystallised from the hot acid liquor in three crops.
Nitric acid of at least 1.46 sp. gr. washes the sulphuric acid off the crystals without dissolving them. Zettnow got 85 to 90 per cent of the theoretical yield.
Source: T. E. Thorpe, Dictionary of Applied Chemistry vol. II (1912), p. 54. Picture: the book's text.
Juu
About 2 days
Maudhui hatari
Blueprint hii ina taratibu za hatari. Ingia na uwashe maudhui ya hatari katika mipangilio ya akaunti yako ili kuona maagizo ya hatua kwa hatua.
IngiaMchoro huu unatengeneza
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.