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El fundamento de esta practica se basa en la determinación de los equivalentes de una solución problema, y lo haremos consiguiendo averiguar la cantidad de una solución patrón necesaria para llegar al punto de equivalencia.
En el agua tenemos tanto bicarbonatos como carbonatos, que son dos bases débiles. Al estar disuelto en el agua su pH será mayor de 7 (solución básica). Para saber que cantidad de carbonatos y bicarbonatos se irá añadiendo HCl e iremos anotando la cantidad de HCl gastado y la variación de pH.
Probeta 100 ml
Vaso precipitado 250 ml
Enlemeyer 250 ml
Soportes
Buretas
Imanes
Pinzas buretas
Agitadores magnéticos
pH-metro
Embudo
Determinación de Carbonatos y Bicarbonatos en Aguas.
3
99 00
Es un factor de corrección que se utiliza para ajustar la solución que se está utilizando.
Nunca de un bote patrón se saca algo con una pipeta. Se vierte el líquido sobre un matraz y de ahí se pipetea.
Solución Tampón: Son aquellas que están formadas por un ácido y una base débiles conjugados . Mientras existan las dos formas conjugadas en solución, el pH se mantendrán en torno al PA del par.
Tabla y Curva de Valoración en hoja a parte.
-V1 = 8'7 mL
mg Na2CO3 = V1(mL) 10-3 (L/mL) 0'1 (mol/L) 106 (g/mol) 103 (mg/g) = 92 mg / L
-V2 = 30 mL
mg NaHCO3 = (V2 - V1)(mL) 10-3 (L/mL) 0'1 (mol/L) 84 (g/mol) 103(mg/g) = 178'92 mg/ L
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Enviado por: Antonio Jose Garcia Romero Idioma: castellanoPaís: España