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154 - Περιεκτικότητα κατά βάρος.
1.
154 – Περιεκτικότητα
κατά βάρος. Γουρζής Στάθης – Φυσικός ΥΣΕΦΕ 2013 -2014 Γενικό Λύκειο Νυδριού Λευκάδος
2.
Θα παρασκευάσουμε ένα
διάλυμα στερεών και θα υπολογίσουμε την περιεκτικότητα κατά βάρος % w/w …
3.
Θα χρησιμοποιήσουμε μια
ποσότητα αλατιού, μια ποσότητα ζάχαρης και την ζυγαριά του εργαστηρίου, μαζί με μερικές υάλους του ρολογιού …
4.
Ανοίγουμε την ζυγαριά
…
5.
… τοποθετούμε την
μια ύαλο του ρολογιού … … και πατάμε « Tare », για τον μηδενισμό του βάρους της.
6.
Παίρνουμε λίγο αλάτι, με
το πλαστικό κουτάλι ... … και το ζυγίζουμε.
7.
Τοποθετούμε την άλλη
ύαλο του ρολογιού … … και πατάμε πάλι « Tare », για τον μηδενισμό του βάρους της.
8.
Παίρνουμε λίγη ζάχαρη, με
το πλαστικό κουτάλι ... … και προσθέτουμε τόση, ώστε να συμπληρώσουμε 10 g.
9.
Ανακατεύουμε τις δύο
ποσότητες και θεωρούμε το διάλυμα ομογενές ... Ζάχαρη 8.2 g Αλάτι 1.8 g περιεκτικότητα κατά βάρος % w/w = ?
10.
… τέλος 1ου
πειράματος …
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