Gravimetric Analysis

What is the molar mass of lithium carbonate?

• 73.89 g/mol

• 105.99 g/mol

• 138.21 g/mol

• 100.09 g/mol

What type of chemical reaction was responsible for the production of the calcium carbonate?

• synthesis

• decomposition

• single replacement

• double replacement

Consider the chemical reaction between calcium chloride and the unknown metal carbonate, which of the following are the spectator ions in the solution?

• Unknown metal cations

• chlorides

• calcium cations

• both the unknown metal cations and chlorides

What would happen to the calculated molar mass if some precipitate seeped through the filter paper?

• molar mass would be too high

• molar mass would be too low

• There would be no effect on the molar mass

• The mass of the precipitate collected would decrease

If a student forgot to cover their experiment with parafilm over the weekend before they filtered their product, how would that affect the calculated molar mass?

• molar mass would be too low

• molar mass would be too high

• molar mass would be unaffected

• molar mass would certainly double

If your clumsy lab partner spilled some of your precipitate during the filtering process, how would that affect your calculated molar mass?

• molar mass would be too low

• molar mass would be too high

• molar mass would be unaffected

• there would be less filtrate collected

Which of the following is the net ionic equation for the production of calcium carbonate?

• Ca⁺ + 3CO ----> CaCO₃

• Ca⁺² + CO₃^-2 ----> CaCO₃

• M⁺² + Ca + CO₃^-2 ----> MCaCO

• M⁺² + Cl^- ----> MCl₂

If you failed to heat the crucible enough times for the masses to be consistent, why would that cause your calculated molar mass to be too high?

• the presence of water causes the mass of the unknown carbonate to be too high

• the moles of calcium carbonate increases

• the mass of the unknown carbonate will be too low

• the moles of the unknown carbonate will be too high

Which equipment was not needed to conduct this lab?

• hot plate

• ring stand

• Bunsen burner

• analytical balance

What is the molar mass of calcium carbonate?

• 73.89 g/mol

• 100.09 g/mol

• 105.99 g/mol

• 138.21 g/mol