Preparation of Salt

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