Which of the following salts is prepared by precipitation method?
  • sodium chloride
  • barium sulfate
  • calcium nitrate
  • ammonium carbonate
How would you prepare a sample of potassium chloride safely in the laboratory?
  • Add excess potassium metal to dilute hydrochloric acid
  • Titrate dilute HCl with aqueous KOH with an indicator
  • Titrate dilute HCl with aqueous KOH once with indicator, then again without
  • Mix aqueous potassium nitrate with aqueous sodium chloride
Which of the following methods is used to prepare zinc sulfate?
  • Add excess zinc chloride to aqueous sodium sulfate
  • Tiltrate dilute H2SO4 with aqueous Zn(OH)2 with an indicator, then again without
  • Add excess solid zinc oxide to dilute sulfuric acid
  • Mix aqueous zinc nitrate with aqueous potassium sulfate
After titrating aqueous NaOH with dilute HCl without indicator, what is my next step to obtain a sample of NaCl ?
  • Filtration
  • Evaporation to dryness
  • Repeat the titration
  • Evaporate to saturation, then cool the solution
After adding aqueous Ca(NO3)2 to dilute H2SO4, what is my next step to prepare a sample of CaSO4?
  • Crystallisation
  • Evaporation to dryness
  • Filtration to get the filtrate
  • Filtration to get the residue
Which of the following can be prepared by titration?
  • Magnesium sulfate
  • Zinc carbonate
  • Lead (II) sulfate
  • Lithium chloride
Why is solid calcium hydroxide added in excess to dilute nitric acid when preparing calcium nitrate salt?
  • To ensure all calcium hydroxide is used up
  • To speed up the reaction
  • To ensure all dilute nitric acid is used up
  • To have maximum yield of calcium nitrate
Which method of preparation of a pure salt solution requires the use of a pipette and burette?
  • BaCl2 + Na2SO4 --> BaSO4 + 2NaCl
  • CuO + HCl --> CuCl2 + H2O
  • NaOH + HCl --> NaCl + H2O
  • MgCO3 + H2SO4 --> MgSO4 + H2O + CO2
Which pair of reagents can be used to prepare copper(II) sulfate salt?
  • Copper metal with dilute sulfuric acid
  • Copper(II) nitrate with sodium sulfate
  • Copper(II) chloride and dilute sulfuric acid
  • Copper(II) carbonate with dilute sulfuric acid
Which two solutions, when mixed together, will form a precipitate?
  • dilute hydrochloric acid and barium nitrate
  • dilute sulfuric acid and sodium hydroxide
  • dilute hydrochloric acid and lead (II) nitrate
  • dilute nitric acid and zinc chloride
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