4. A 0.91g sample of a wheat flour was analyzed by the Kjedahl method. The NH3 formed was distilled into a 50mL of 0
Posted: Wed Jul 06, 2022 11:01 am
4. A 0.91g sample of a wheat flour was analyzed by the Kjedahl method. The NH3 formed was distilled into a 50mL of 0.05M HCl, a 7.46mL back-titration with 0.05M NaOH was required. Calculate the % of protein in the flour.
5. A 0.527g sample of a mixture containing Na2CO3, NaHCO3, and inert impurities is titrated with 0.109M HCl requiring 15.7mL to reach the phenolphthalein end point. What is the % Na2CO3 and NaHCO3 in the mixture?
5. A 0.527g sample of a mixture containing Na2CO3, NaHCO3, and inert impurities is titrated with 0.109M HCl requiring 15.7mL to reach the phenolphthalein end point. What is the % Na2CO3 and NaHCO3 in the mixture?