Question

Reactions: NaHCO3 (aq) + HCl (aq) + NaCl (aq) + CO2 (g) + H20 (1) Table 1 Trial Final Mass (g) CO2 Lost (g) Mass of Unknown Mixture (g) 2.01 2.04 2.03 Initial Mass of unknown and HCl (g) 42.09 42.14 42.53 1 41.50 41.11 41.5 0.59 1.03 1.03 Percent error measured-0.80 x 100 = % Error for NaHCO, measured=0 0.20 0 =% Error for NaCl ** Use the average of the 3 percent values you previously found ** Total sodium bicarbonate used in the mixture: Total sodium chloride used in the mixture: Actual percent composition of sodium bicarbonate: 80% Actual percent composition of sodium chloride: 20%

• Using the data from the table, determine the percent composition of the unknown mixture. (using stoichiometry)
  • How much Sodium Bicarbonate is in the Mixture?
  • How much Sodium Chloride is in the Mixture?
• Using the percent compositions, determine the percent error using the following information:
  • Actual % comp of Sodium Bicarbonate = 80%
  • Actual % comp of Sodium Chloride = 20%

Answer 1

Trial 2: Unknown mixture contain 1.9664 g Nattoo, e. Nach = 0.0736 g % of Natt CO₂ = 1.9 669 Xtoo = 96.39% 2.09 % of Nall = 0.0736 x 100 = 3.61%. 2.04 0.9639 – 0.8 x 100 = 20.48%. 7 error for NaHCO3 = 0.8 0.0361-0.2 x 100 = 81.95% 1. error for Nact - 0.2 Tosial 3 : Unknown mixture contains 1.9669 g of Nato - Nall= 2.03- 1.9664 0.0636 g in 7 of NaHCO = of NaHCO3 = 1.9664 x 100 = 06. 8 67% 2.03. 1. of Nach - Do 313 0/0 7 error 0.96867 -0.8 x 100 = 21.08% for Nathoz - - 0.8 0.0313 - 0.2 x 100 = 84.35%. 0.2 . enor for Nall-