Salt Preparation method

potassium nitrate is a _________ salt.

• soluble SPA

• soluble non-SPA

• insoluble salt

Which method is used to prepare potassium nitrate?

• titration

• add excess solid reagent to acid

• precipitation

Which of the following is NOT a step in titration?

• Fill up a burette with some acid.

• Use a pipette to measure 25.0 cm³ of alkali.

• Add two drops of methyl orange indicator to the alkali.

• Filter the mixture to obtain the residue.

• Repeat the titration with the same volumes of acid and alkali but without the indicator.

Choose two reagents that can be used to prepare potassium nitrate.

• dilute hydrochloric acid

• dilute nitric acid

• aqueous potassium hydroxide

• potassium metal

• aqueous potassium nitrate

copper(II) chloride is a _________ salt.

• soluble SPA

• soluble non-SPA

• insoluble salt

Which method is used to prepare copper(II) chloride?

• titration

• add excess solid reagent to acid

• precipitation

Explain why the following steps are carried out to obtain pure and dry sample of copper(II) chloride crystals.

• To ensure acid is fully reacted

• Add excess copper(II) oxide to hydrochloric acid.
• To remove excess copper(II) oxide

• Filter the mixture.

• To remove impurities and obtain pure, dry crystals

• Wash the crystals with a little cold water & dry between filter paper.

• So that the crystals will form and, not decompose

• Heat filtrate until it is saturated & allow it to cool.

Select two other reagents that can react with hydrochloric acid to form copper(II) chloride.

• Copper metal

• Copper(II) carbonate

• Copper(II) hydroxide

• Copper(II) nitrate

• Copper(II) sulfate

Calcium sulfate is a/an _________ salt.

• soluble SPA

• soluble non-SPA

• insoluble salt

Which method is used to prepare calcium sulfate?

• titration

• add excess solid reagent to acid

• precipitation