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Exercício de volumetria
Exercício:
Um fabricante de paes e similares deseja conhecer a quantidade relativa de proteína presente em um lote de farinha de trigo. Um quimico pesa 4,0030g de farinha e examina a amostra pelométodo Kjeldahl>após a amostra ser digerida, a amonia que ela produz é retida em um frasco que originalmente contém 50mL de HCl de 0,1450M.Depois se constata que a solução de ácido clorídrico com a amonia retida fornece um ponto final em 17,54 mL, quando titulada com NaOH de 0,1290M. Qual a percentagem (m/m) de nitrogenio na farinha?
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