Soda Ash Composition Quantitative Analysis
For the standardization of HCl titrant, 0.1025 g Na2CO3 of 99.5% purity (FW: 106.00) required 8.20 mL of the titrant to reach the phenolphthalein endpoint.
FW: NaOH (40.00), NaHCO3 (84.01), Na2CO3 (106.00)
What is the molarity of the titrant?
The chemist obtained a 3.150 g sample and dissolved it in distilled water to produce a 50.0 mL solution. An aliquot of 10.00 mL was obtained and diluted in a 100.0 mL volumetric flask. A 50.00-mL aliquot of the diluted sample was taken and it required 25.70 mL of titrant for the methyl orange endpoint, while another 50.00-mL aliquot required 15.00 mL for the phenolphthalein endpoint.
What is/are the major component/s of the sample?
a. NaOH b. Na2CO3 c. NaHCO3 d. a and b e. b and c
What are the vph (volume from start to phenolphthalein) and vmo (volume from phenolphthalein to methyl orange) for the 50.00-mL aliquots?
Calculate the moles and percent composition (%w/w) of each component in the sample.
If the component is not present, simply type in "0".
mol NaOH =
mol Na2CO3 =
mol NaHCO3 =
%NaOH =
%Na2CO3 =
%NaHCO3 =