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ID number:330146
 
Evaluation:
Published: 28.01.2013.
Language: Latvian
Level: College/University
Literature: 7 units
References: Used
Extract

Sedimentācija: 50ml cilindrā ieber 5,0g vielas, līdz atzīmei uzpilda ar ūdeni un krata 5 minūtes. Nostādina 15 minūtes. Bārija sulfātam nevajadzētu nosēsties zem 15ml atzīmes.
Fosfāti: 1,0 g vielas silda kopā ar 3 ml slāpekļskābes un 7 ml ūdens 5 minūtes. Nofiltrē un filtrātām pievieno 5 ml amonija molibdēna. Nostādina 5 minūtes. Dzeltenā krāsa nedrīkst būs intensīvāka par fosfātu strandartšķīdumu.
PO4-3 + 3NH4+ 12MoO42- + 24H+ → (NH4)3[PO4(MoO3)12] + 12H2O
Sulfīdi: Vielai pievieno sālsskābi, jūtama sērūdeņraža smaka, kolbu nosedz ar svina acetātā samitrinātu filtrapapītu, rodas melns krāsojums.
S2- + 2H+ → H2S↑
Pb2+ + S2- → PbS↓…

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