1. Using the MSDS, what type of materials are incompatible with HCl,
hydrochloric acid? What first aid measures are appropriate if spilled on skin?







2. Explain the difference between a chemical and a physical method of separation.
Give an example of each in the ternary mixture experiment.







3. A sample weighing 3.145 g was found by experiment to contain 1.234 g of NaCl.
What is the percentage of NaCl in the sample? If the sample actually contained 1.345 g
of NaCl, what is the percent recovery of NaCl in the experiment?







4. During our separation experiment, the CaCO3 is dissolved using HCl.
Write a balanced chemical reaction describing this.
Why is it necessary to add the acid slowly?







5. It is frequently observed that the mass of recovered components exceeds
the original sample mass. Comment on possible reasons for this observation.