Pure Chem

Silver chloride is often used as an antidote for mercury poisoning as it can assist in the elimination of mercury.

Which of the following shows the solubility of silver chloride and the reactants that can be used to prepare the salt in the laboratory?

• Solubility : insoluble

  Reactants : silver carbonate and potassium chloride

• Solubility : insoluble

  Reactants : silver nitrate and lithium chloride

• Solubility : soluble

  Reactants : silver and dilute hydrochloric acid

• Solubility : soluble

  Reactants : silver oxide and dilute hydrochloric acid

A student was asked to prepare a sample of magnesium sulfate, and chose a solid to add to sulfuric acid. The experiment failed.

Which solid was chosen?

• magnesium carbonate

• magnesium nitrate

• magnesium

• magnesium oxide

Tags

NGSS.HS-PS1-1

The table shows the solubility in water of some iron compounds.

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

• adding excess iron to dilute sulfuric acid at room temperature

• precipitating the salt by adding iron (II) sulfate solution to dilute hydrochloric acid

• titrating iron (II) hydroxide with dilute hydrochloric acid

• warming excess iron (II) oxide with dilute hydrochloric acid

Which is the most suitable method for separating the products of the reaction below:

NaCl (aq) + AgNO₃ (aq) --> AgCl (s) + NaNO₃ (aq)

• chromatography

• crystallisation

• distillation

• filtration

Which salt can be prepared using the titration method?

• calcium sulfate

• lead(II) nitrate

• sodium sulfate

• zinc carbonate

Which of the following is the best way to prepare pure calcium sulfate?

• mixing calcium nitrate to sulfuric acid and collect the residue

• adding excess calcium to sulfuric acid, filter to collect the filtrate

• mixing calcium chloride and zinc sulfate and filter to collect the filtrate

• titrating calcium carbonate and hydrochloric acid and heat up the mixture to remove water content

Tags

NGSS.HS-PS1-6

Which salt can be prepared by adding a metal oxide in excess to an acid, filtration and finally crystallization?

• copper(II) sulfate

• barium sulfate

• silver chloride

• copper(II) hydroxide

Which of the following salts are soluble?

(you can choose more than 1)

• sodium carbonate

• calcium chloride

• lead(II) chloride

• zinc sulfate

Tags

NGSS.HS-PS1-5

Which of the following apparatus is essential in the preparation of ammonium chloride using titration?

(You may select more than one)

• pipette

• burette

• measuring cylinder

• beaker

Magnesium sulfate is formed by reacting sulfuric acid with an excess of solid Magnesium oxide.

Why is an excess of Magnesium oxide used in this preparation?

• To ensure that all the Magnesium oxide has been reacted.

• To ensure that all the acid has been reacted.

• To ensure that maximum amount of magnesium sulfate is formed

• To ensure that the reaction is complete.