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154 – Περιεκτικότητα κατά βάρος.

Γουρζής Στάθης – Φυσικός
ΥΣΕΦΕ 2013 -2014
Γενικό Λύκειο Νυδριού Λευκάδος
Θα παρασκευάσουμε ένα διάλυμα στερεών
και θα υπολογίσουμε την
περιεκτικότητα κατά βάρος % w/w …
Θα χρησιμοποιήσουμε μια ποσότητα αλατιού,
μια ποσότητα ζάχαρης και την ζυγαριά του
εργαστηρίου, μαζί με μερικές υάλους του
ρολογιού …
Ανοίγουμε την ζυγαριά …
… τοποθετούμε την μια ύαλο του ρολογιού …

… και πατάμε « Tare »,
για τον μηδενισμό του βάρους της.
Παίρνουμε λίγο αλάτι,
με το πλαστικό κουτάλι ...

… και το ζυγίζουμε.
Τοποθετούμε την άλλη ύαλο του ρολογιού …

… και πατάμε πάλι « Tare »,
για τον μηδενισμό του βάρους της.
Παίρνουμε λίγη ζάχαρη,
με το πλαστικό κουτάλι ...

… και προσθέτουμε τόση,
ώστε να συμπληρώσουμε 10 g.
Ανακατεύουμε τις δύο ποσότητες και
θεωρούμε το διάλυμα ομογενές ...

Ζάχαρη 8.2 g
Αλάτι 1.8 g

περιεκτικότητα κατά βάρος % w/w = ?
… τέλος 1ου πειράματος …

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154 - Περιεκτικότητα κατά βάρος.