Příprava CuO
Laboratorní protokol z chemie
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Kvarta
Téma: Příprava CuO
Úkol:
Připravte oxid měďnatý a porovnejte hmotnost produktu získaného při pokusu s teoretickým výpočtem.
Pomůcky a chemikálie:
· Kádinky (250 a 100 ml)
· Hodinové sklo
· Váhy
· Navažovací lodička
· Lžička na chemikálie
· Odměrný válec (100 ml)
· Stojan s varným kruhem
· Skleněná tyčinka
· Büchnerova nálevka
· Filtrační papír
· Odsávací baňka
· Pentahydrát síranu měďnatého
· 10%-ní roztok hydroxidu draselného
· Kahan
· Síťka s azbestem
Postup:
§ Před zahájením pokusu vypočítejte hmotnost oxidu měďnatého, který lze připravit z 5,00 g pentahydrátu síranu měďnatého CuSO4.5H2O.
Příprava probíhá ve dvou fázích. Nejdříve reakcí roztoku síranu měďnatého a roztokem hydroxidu draselného vzniká sraženina hydroxidu měďnatého a roztok síranu draselného. Dále se hydroxid měďnatý zahříváním rozkládá za vzniku pevného oxidu měďnatého a vody.
§ Odměřte 5,00 g pentahydrátu síranu měďnatého. Látku rozpusťte ve 100 ml vody v kádince (roztok popř. pro urychlení rozpouštění zahřejte).
§ Za neustálého míchání skleněnou tyčinkou přidejte k roztoku v kádince 21 ml 10%-ního
roztoku hydroxidu draselného. Která látka vytváří sraženinu při sledované reakci? (A)
§ Kádinku se směsí zakryjte hodinovým sklem a zahřívejte ji na síťce s azbestem k varu. Která látka vzniká při zahřívání? (B)
§ Sraženinu od roztoku oddělte filtrací za sníženého tlaku. Produkt na filtru promyjte dvakrát 100 ml vody.
§ Produkt přeneste do Petriho misky a nechte usušit.
§ Zvažte suchý produkt.
Výpočty:
Výsledky a závěr:
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