CIE IGCSE 8.3 Making soluble and insoluble salts

What does the word insoluble mean?

• Does dissolve

• Doesn't dissolve

• Is part of a solid

What type of reaction produced an insoluble salt?

• Neutralisation reaction

• Precipitation reaction

• Titration reaction

• Insoluble reaction

Identify the 'evaporating basin' from the diagrams.

• A
• B
• C
• D

When a soluble salt is formed from an acid and an insoluble base, how do you know when an excess of a base has been added?

• When bubbles of gas appear

• When the reactant all dissolves

• When some of the reactant is left unreacted/undissolved

• When a colour change happens

Tags

NGSS.MS-PS1-2

Why do you add excess of the insoluble reactant when making a soluble salt?

• To make sure all the acid is used up

• To separate the solid from the solution

• To make sure a reaction occurs

• To have the reaction happen faster

Tags

NGSS.MS-PS1-5

How do you separate an excess insoluble reactant from a solution?

• Filtration

• Precipitation

• Crystalisation

• Evaporation

When producing a soluble salt in a reaction between an acid and an alkali, how can you prepare dry solid crystals from the solution?

• Filtration

• Neutralisation

• Condensation

• Evaporation/crystallisation

What reactants could you start with if you wanted to make zinc chloride

• zinc and hydrochloric acid

• zinc oxide and hydrochloric acid

• zinc oxide and sulfuric acid

• zinc carbonate and sulfuric acid

What is the purpose of a titration when making pure salts?

• To test if reactants react.

• To determine the exact quantities needed for neutralisation

• To calculate the concentration of the salt

• To test quality of reactants.

Which is NOT a step when making insoluble salts?

• mix

• filter

• rinse

• crystallise