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Esperienza di laboratorio.pdf

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Reazioni di doppio scambio con formazione di precipitato - osservazione in laboratorio

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REAZIONI DI DOPPIO SCAMBIO
CON FORMAZIONE DI UN PRECIPITATO
ESPERIENZA IN LABORATORIO DEL 07/02/23
ALICE CRISANTE 3^E
VIDEO TUTORIAL
Verificare la solubilità di una soluzione
OBIETTIVO:
CENNI
TEORICI
SOLVENTE
SOLUTO
Una SOLUZIONE
è un miscuglio
omogeneo costituito da:
(in quantità maggiore)
(in quantità minore)
La SOLUBILITA' è
una proprietà chimico-
fisica e rappresenta
la quantità massima di
soluto che può essere
disciolto, a una data
temperatura,
in una certa quantità
di solvente.
Quando la soluzione
diventa SOPRASATURA
(presenta un eccesso di
soluto) si può osservare il
CORPO DI FONDO.
VARIAZIONE SOLUBILITA' ->
La solubilità dei solidi nei liquidi
aumenta all'aumentare della
temperatura. Al contrario la
solubilità dei gas nei liquidi
diminuisce all'aumentare della
temperatura, è direttamente
proporzionale alla pressione
(legge di Henry).
MATERIALE
Portaprovette con 4 provette
Pipette
PROCEDIMENTO:
INSERIRE NELLE 4 PROVETTE LE RISPETTIVE SOSTANZE 1
1.
Ad

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Esperienza di laboratorio.pdf

  • 1. REAZIONI DI DOPPIO SCAMBIO CON FORMAZIONE DI UN PRECIPITATO ESPERIENZA IN LABORATORIO DEL 07/02/23 ALICE CRISANTE 3^E VIDEO TUTORIAL
  • 2. Verificare la solubilità di una soluzione OBIETTIVO:
  • 3. CENNI TEORICI SOLVENTE SOLUTO Una SOLUZIONE è un miscuglio omogeneo costituito da: (in quantità maggiore) (in quantità minore) La SOLUBILITA' è una proprietà chimico- fisica e rappresenta la quantità massima di soluto che può essere disciolto, a una data temperatura, in una certa quantità di solvente. Quando la soluzione diventa SOPRASATURA (presenta un eccesso di soluto) si può osservare il CORPO DI FONDO. VARIAZIONE SOLUBILITA' -> La solubilità dei solidi nei liquidi aumenta all'aumentare della temperatura. Al contrario la solubilità dei gas nei liquidi diminuisce all'aumentare della temperatura, è direttamente proporzionale alla pressione (legge di Henry).
  • 4. MATERIALE Portaprovette con 4 provette Pipette
  • 6. INSERIRE NELLE 4 PROVETTE LE RISPETTIVE SOSTANZE 1 1.
  • 7. 2.INSERIRE NELLE 4 PROVETTE LE RISPETTIVE SOSTANZE 2
  • 8. 2.INSERIRE NELLE 4 PROVETTE LE RISPETTIVE SOSTANZE 2
  • 13. CONCLUSIONE: Si può osservare una fase solida che si separa dalla soluzione, ciò avviene a causa della presenza di soluto oltre il limite di saturazione, in questo modo si forma il precipitato. Tra la SOSTANZA 1 e SOSTANZA 2 avviene una reazione di scambio doppio (i composti si scambiano gli elementi).