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ŞANDRU MIRELA
OPERAŢII DE BAZĂ ÎN
LABORATOR
DETERMINAREA DENSITĂŢII
LICHIDELOR
COLEGIUL TEHNIC “CD
NENITESCU” BAIA MARE
Curs TIC Avansați Șandru Mirela
1
Secțiunea 12
Cuprins
 Generalități
 Factori care influențează densitatea
 Densitatea relativă
 Metode pentru determinarea densității
1. Determinarea densității lichidelor cu ajutorul
densimetrelor
2. Determinarea densității lichidelor prin cântărire
3. Determinarea densității lichidelor cu ajutorul
picnometrului
3
Secțiunea 24
Exemplu de comparație
 STICLĂ
 FORMĂ DE CON
 PREVĂZUTE CU
TERMOMETRU
 G/CM3
 STICLĂ
 DOP RODAT
 ETALONATE 200
 DIFERITE CAPACITĂŢI
DENSIMETRU PICNOMETRU
5
MODUL DE LUCRU
MĂSURAREA
DENSITĂŢII
LICHIDELOR
Proba de
analizat se
introduce într-
un cilindru de
sticlă
Se introduce
densimetrul
astfel încât să nu
atingă pereții
cilindrului
Se citește
temperatura
Se citește
densitatea
6
Secțiunea 37
8
Explorare opțiuni poze
9
10
09:00
• Introducere
• Structură punctaj
10:00
• Subiectul 1
• Exerciții
11:00
• Subiectul 2
• Exerciții
11
Prepararea
solutiilor
Cântărirea
substanței
dizolvate
Aducerea
cantitativă în
soluție
Agitare
Etichetare
Introducerea
apei distilate
Introducerea
substanței
dizolvate
OmogenizareEtichetare
Depozitare
12
PREPARAREA SOLUŢIILOR
Prepararea
soluțiilor de
concentrație
normală
Calculul
substanței
dizolvate
Cântărirea
substanței
dizolvate
Sticlă de ceas Balanță analitică
Măsurarea
volumului de apă
distilată
Cilindru gradat Pâlnie de stică Pahar berzelius
Dizolvarea
Omogenizarea
Pahar Berzelius Baghetă de sticlă
13
Secțiunea 414
Exemplu chart
2%2.04%
90.50%
5.46%
Răspândirea apei pe glob
Ape dulci
Apele mărilor și
oceanelor
Ghețari și calote glaciare
Ape subterane
15
FIŞĂ DE RECAPITULARE
Materiale necesare Sarcini de lucru Calcule
matematice
XI-A Iulia Popescu
XI-A Andrada Ionescu
XI-A Cristian Popescu
XI-A Daniel Ionescu
XII-A Camelia Popescu
XII-A Ioana Ionescu
XII-A Codruta Ionescu
16
Linii de text ce apar secvențial
17
Densitatea soluțiilor
Concentrația soluțiilor
Punctul de fierbere
Secțiunea 418
TEST
19
 1. ENUMERAŢI METODELE PENTRU
DETERMINAREA DENSITĂŢII LICHIDELOR
 2. DEFINIŢI DENSITATEA
 3. PRECIZAŢI UNITATEA DE MĂSURĂ ÎN SI
 4. ENUMERAŢI TREI NORME DE PROTECŢIA
MUNCII LA DETERMINAREA DENSITĂŢII ÎN
LABORATOR
Linkuri
20
 http://en.wikipedia.org/wiki/Density
 http://www.khanacademy.org/science/chemistry
 http://www.referat.ro/
 http://www.didactic.ro/materiale-
didactice/19199_densitatea
BIBLIOGRAFIE
21
 http://www.qcpsac.com/Imagines/Temperatura
 /densimetro.png
 https://upload.wikimedia.org/wikipedia/commons/e/eb/Pycnomet
er_
 full.jpg
 http://upload.wikimedia.org/wikipedia/commons/6/67/Mohr-
Westphalsche-Waage.jpg
 Oceanografie http://oceanclass.blogspot.ro/2008/10/apa-de-
mare.html
 Teodorescu M., Vlădescu L., Tehnica măsurărilor mărimilor fizice şi
aparatură de laborator, Editura Didactică şi Pedagogică, Bucureşti;
 Ilie Ştefan, Probleme de chimie anorganică şi chimie organică,
Editura Fast Print, Bucureşti.
RECAPITULARE
22

DEFINITIA
DENSITATII
PREPARAREA
SOLUTIILOR
BALANTA
MOHR
WESPHAL
PICNOMETRU
DENSIMETRU
23

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