Calcula ¿cuál es la concentración molar de una solución que se prepara disolviendo 70 gramos de NaOH en agua hasta formar 2. 5 litros de disolución?
En resumen
Mm NaOH = 40 g / mol V = 2. 5 L 1. Calcular moles de NaOH mol = 70 g NaOH x 1 mol NaOH ```````````````` 40 g NaOH mol = 1. 75 2. Calcular M M = mol soluto / V(L) M = 1. 75 mol / 2. 5 L M = 0. 7 molar.
Mm NaOH = 40 g / mol
V = 2.
5 L
1.
Calcular moles de NaOH
mol = 70 g NaOH x 1 mol NaOH ```````````````` 40 g NaOH
mol = 1.
75
2.
Calcular M
M = mol soluto / V(L)
M = 1.
75 mol / 2.
5 L
M = 0.
7 molar.
.
Mm NaCl = 58. 45 g / mol 1. Calcular moles n = masa / Mm n = 58 g / 58. 45 g / mol = 0. 99 mol 2. Colcular M = moles / V(L) M = 0. 99 mol / 1 L M = 0. 99 ≈ 1 molar.