Grade 6Physical Chemistry
10 mL of a solution containing Na2CO3 and NaHCO3 were neutralized by 5.0 mL of a 0.10 mol L-1 solution of HCl using phenolphthalein as indicator. To the obtained system, methyl orange was added and it required an additional 10 mL of the HCl solution for complete neutralization. On the basis of this information, indicate, respectively, the concentration in the solution analyzed, in g L-1, of Na2CO3 and NaHCO3.a) 2.65 and 4.20b) 5.30 and 4.20c) 5.30 and 2.10d) 2.65 and 2.10Answer: B
10 mL of a solution containing Na2CO3 and NaHCO3 were neutralized by 5.0 mL of a 0.10 mol L-1 solution of HCl using phenolphthalein as indicator. To the obtained system, methyl orange was added and it required an additional 10 mL of the HCl solution for complete neutralization. On the basis of this information, indicate, respectively, the concentration in the solution analyzed, in g L-1, of Na2CO3 and NaHCO3.a) 2.65 and 4.20b) 5.30 and 4.20c) 5.30 and 2.10d) 2.65 and 2.10Answer: B
