Si desea preparar un litro de acido sulfurico a partir de acido comercial cuyo etiqueta indica su concentracion centisimal 97. 6 % y su densidad 1. 85 g / cm a) la molaridad de dicho acido b) el volumen para preparar la disolucion pedida.
En resumen
Mm H2SO4 = 98 g / molV = 1 LConcentración : 97. 6 %d = 1. 85 g / cm³a. Calcular la MolaridadM = 97. 6 g H2SO4 x 1 mol H2SO4 x 1. 85 g solc. X 1000 cm³ ``````````````````````````` ``````````````````````````` ````````````````````````` ``````````````````````` 100 g solc.
Mm H2SO4 = 98 g / molV = 1 LConcentración : 97.
6 %d = 1.
85 g / cm³a.
Calcular la MolaridadM = 97.
6 g H2SO4 x 1 mol H2SO4 x 1.
85 g solc.
X 1000 cm³ ``````````````````````````` ``````````````````````````` ````````````````````````` ``````````````````````` 100 g solc.
98 g H2SO4 1 cm³ 1 Litro solc.
M = 18.
42 molarb) el volumen para preparar la disolucion pedidaV = 1 mol H2SO4 x 1 L solc.
X 1000 cm³ ````````````````` ````````````````````` 18.
42 mol H2SO4 1 litro solc.
V = 54.
28 cm³.
V1 x C1 = V2 x C2 V1 = ? C1 = 14 M V2 = 300 mL C2 = 18 M calcular V1 V1 = 300 mL x 18 M `````````````````````` 14 M V1 = 385. 7 mL.
200ml HCl x (0, 4molesHCl / 1000ml) x (36, 5gHCl / 1molHCl) x (100g / 36, 2g) x (1ml / 1, 18g) = 6, 8mlMolaridad ácido comercial : (36, 2g / 100g) x (1molHCl / 36, 5g) x (1, 18g / 1ml) x (1000ml / 1L) = 11, 70M.