Soluciones valoradas, Sin duda las soluciones molares son utilizadas en todos los laboratorbiológico del mundo, de manera cotidiana. Ejercicio. Calcula los moles contenidos en 7.5 g de Mg (OH) 2 (hidróxido de magnesio). Llena los espacios vacíos.
Paso 1: Calcular el PM
Mg = 24x1 = _ _ _ _ _
H = 1x2 = _ _ _ _ _
O = 16x2 = _ _ _ _ _
Paso 2: Determinar los moles con la formula
= ( / ) = ( _ _ _ _ _ / _ _ _ _ _ _ _ / ) = _ _ _ _ _ _ _ _ _ _ _
MOLARIDAD:
Para hacer las valoraciones de molaridad de estas soluciones utilizamos la fórmula: = / ( ())
Ejercicio: Se prepara una disolución con 5 g. De hidróxido de sodio NaOH. Si el volumen final es de 27.1 mL, la concentración molar de la disolución es:
Paso 1: Determinar los datos: Datos: M =? g de NaOH = 5 g Vol de solución = 27.1mL = _ _ _ _ _ _ _ L
Dato implícito:
PM (NaHO) Na = 23x1 = _ _ _ _
H = 1x1 = _ _ _ _
O = 16x1 = _ _ _ _
_ _ _ _ _ _ g / mol Paso 2: Cálculo de la molaridad con los datos = ( / ()) = ( _ _ _ _ _ _ / _ _ _ _ _ _ / _ _ _ _ _ _ ) = _ _ _ _ _ _ _ _ _ /
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