CC8 Acids and Alkalis Revision

What are the safety precautions that should be observed when handling different acids and alkalis?

• Wear protective clothing and eyewear, work in a well-ventilated area, and store chemicals properly.

• Use bare hands to handle chemicals and store them in open containers.

• Ignore safety labels and mix acids and alkalis freely.

• Store acids and alkalis together in a warm, humid environment.

State the pH values associated with acidic, alkaline and neutral solutions.

• Acidic: pH < 7, Neutral: pH = 7, Alkaline: pH > 7

• Acidic: pH > 7, Neutral: pH = 7, Alkaline: pH < 7

• Acidic: pH = 7, Neutral: pH < 7, Alkaline: pH > 7

• Acidic: pH > 7, Neutral: pH > 7, Alkaline: pH < 7

What is the relationship between hydrogen ion concentration and pH?

• As hydrogen ion concentration increases, pH increases.

• As hydrogen ion concentration increases, pH decreases.

• Hydrogen ion concentration and pH are not related.

• As hydrogen ion concentration decreases, pH decreases.

How does a base react in a neutralisation reaction?

• It donates protons to the acid.

• It accepts protons from the acid.

• It releases hydrogen gas.

• It forms a precipitate.

Which of the following is a correct symbol equation for the reaction of an acid with a metal oxide?

• HCl + NaOH → NaCl + H2O

• H2SO4 + CuO → CuSO4 + H2O

• HNO3 + MgO → Mg(NO3)2 + H2

• HCl + ZnO → ZnCl2 + H2

What are the steps involved in preparing a soluble salt from an acid and an insoluble reactant?

• Add the insoluble reactant to the acid, filter the mixture, and evaporate the solution.

• Mix the acid and insoluble reactant, heat the mixture, and distill the solution.

• Dissolve the insoluble reactant in water, add acid, and crystallize the salt.

• React the acid with a soluble base, filter the solution, and dry the salt.

Recall and use state symbols.

• (s) for solid, (l) for liquid, (g) for gas, (aq) for aqueous

• (s) for solution, (l) for liquid, (g) for gas, (aq) for aqueous

• (s) for solid, (l) for liquid, (g) for gas, (aq) for gas

• (s) for solid, (l) for liquid, (g) for gas, (aq) for solid

What is the result of the reaction between an alkali and an acid?

• Salt and water

• Gas and water

• Salt and gas

• Water and gas

What happens to the ions from acids and alkalis during neutralisation?

• They form water and a salt.

• They remain unchanged.

• They form a gas.

• They form a precipitate.

Describe how to carry out an acid–alkali titration.

• Use a pH meter to measure the endpoint

• Add acid to alkali until the solution turns pink

• Add alkali to acid until the solution turns colorless

• Add acid to alkali until the solution turns colorless