determinacion da acidez total dun vinagre
TRANSCRIPT
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Determinación da acidez total
dun vinagreAlberto López VeigaMarta Mendía SertalCarlota Pérez Carpio
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NaOH 0,5M
Funil
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Coa pipeta con aspirador recóllense 10 mL de vinagre e se botan no Erlenmeyer.
Pipeta
Aspirador
Vinagre
Fenolftaleina
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Engádeselle ao vinagre auga destilada, entre 100 e 150 mL empregando un frasco lavador.
Matraz Erlenmeyer Frasco
lavador con agua destilada
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Bótanselle 2 gotas de fenolftaleína para que ao engadir a sosa cambie de cor.
Fenolftaleína
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Coa bureta bótanse un total de 23,1 mL de NaOH, volume co que cambia de cor.
Soporte con noz e pinzas
Bureta
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Resultado final:M= (MNaOH · VNaOH)/(VHAc))
M= (0,5M ·2,31·10 L)/(0,01L)
= 1,115 M
Grao acidez=(MNaOH·VNaOH·MmHAc) · 100/(Vvinagre)
=(0,5M·2,31·10 L·60g/mol)· 100/(10mL) = 6,93
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