Indicators are used to determine whether a solution is acidic or alkaline. Acids react in neutralisation reactions to produce salts.
Name the products of the reaction between zinc and hydrochloric acid.
Zinc chloride and hydrogen
Zinc hydrochloride and water
Zinc chloride and water
What term is given to a reaction which transfers heat energy to the surroundings?
In the preparation of zinc chloride crystals from zinc carbonate and hydrochloric acid, why is the mixture filtered after the zinc carbonate has been added to the acid?
To allow large crystals to form
To remove excess zinc carbonate
To remove excess zinc chloride
What is the ion produced by acids in aqueous solution?
When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?
In the preparation of a salt, why is the saturated solution of the salt left in a warm, dry place for a few days rather than heated over a water bath?
To speed up the evaporation of the water
To remove impurities
Which of these pH values is the pH of an acidic solution?
Which of these substances is a weak acid? - Higher
What is the best definition of a weak acid? - Higher
An acid which is only partially ionised in aqueous solution
An acid with a pH between 5.0 and 6.9
A dilute solution of an acid
A acid of concentration 1 mol/dm3 has a pH of 2.0. The acid is diluted to a concentration of 0.1 mol/dm3. What is its new pH? - Higher