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Arnau Alier Torres
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||||
G52
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# Tabla de disoluciones
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||||
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||||
| Dissolució | Dilució* | g/L de NaCl | mol/L de NaCl | Densitat (g/mL) |
|
||||
| ----------------- | ---------- | ----------- | ------------- | ---------------- |
|
||||
| Aigua destil·lada | 50 (mL) | - | - | 0,9984 |
|
||||
| Dissolució “mare” | 50 (mL) | 128.3 | 2.193 | 1,1267 |
|
||||
| 1ª dilució | 25/50 (mL) | 67.4 | 1.152 | 1,0659 |
|
||||
| 2ª dilució | 10/50 (mL) | 27.4 | 0.468 | 1.0258 |
|
||||
| Mostra problema | -/50 (mL) | 61.5 | 1.051 | 1.0599 |
|
||||
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||||
# Cálculos densidades
|
||||
$$
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||||
\huge Densidad (\frac g {mL}) = \frac {(m_2 - m_1)[g]} {V[mL]}
|
||||
$$
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![[../../Ilustraciónes/Practica L4 12-10-25_01.excalidraw.svg]]
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||||
# Cálculos de concentración NaCl
|
||||
$$
|
||||
\huge {g/ml} \space de \space NaCl = g/ml - g/ml \space de \space destil·lada
|
||||
$$
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||||
$$
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||||
\huge M |NaCl| = 23+35.5 = 58.5
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||||
$$
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||||
$$
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||||
\huge g/l\space NaCl \space \cdot \frac {1 Mol \space NaCl} {58.5 g\space NaCl} = mol/l \space NaCl
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||||
$$
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![[../../Ilustraciónes/Practica L4 12-10-25_01_0.excalidraw.svg]]
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# Grafica
|
||||
![[../../Ilustraciónes/Practica L4 12-10-25_09.excalidraw.svg]]
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||||
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# % en massa50 (mL), M (Molaritat) i m (molalitat)
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||||
$$
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||||
\huge \%masa=\frac {g/L*L} {Kg}
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||||
$$
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||||
$$
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||||
\huge Molaridad = \frac {Mol/L*L} {L}; L=0.025
|
||||
$$
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||||
$$
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||||
\huge molalitat = \frac {Mol/L*L} {Kg};Kg=0.025
|
||||
$$
|
||||
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||||
![[../../Ilustraciónes/Practica L4 12-10-25_09_0.excalidraw.svg]]
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||||
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||||
# Problemes
|
||||
Quan s’estava preparant la dissolució mare no es van incloure les rentades del vas de precipitats al matràs, però creiem que no va alterar notòriament la dissolució mare ja que eren unes quantitats molt petites de dissolució que es va descartar. Per les dilucions sí que es van incloure les rentades.
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