Acids and Bases

which statement about bases is true?

• they are all alkalis

• they can neutralise acids

• they are all soluble

which statement about alkalis is true?

• they are all bases

• they cannot neutralise acids

• they are all insoluble

which ion is responsible for solutions being acidic?

• hydroxide ion

• hydrogen ion

• hydrogen carbonate ion

what name is given to all metal oxides and metal hydroxides?

• acids

• alkalis

• bases

which of these substances is a weak acid?

• citric acid

• nitric acid

• hydrochloric acid

what is the best definition of a weak acid?

• an acid with a pH between 5.0 to 6.9

• a dilute solution of an acid

• an acid which ionises partially

• an acid which ionises partially in water and concentration of hydrogen ions is low

what happens to the pH of a solution of hydrochloric acid as calcium oxide is added?

• it rises

• it falls

• it stays the same

which of the following is a diprotic acid?

• hydrochloric acid

• sulphuric acid

• ethanoic acid

• phosphoric acid

which of the following solutions can turn blue litmus red?

• sulphur dioxide in benzene

• ammonia in water

• hydrogen chloride in methylbenzene

• carbon dioxide in water

glacial ethanoic acid does not turn dry blue litmus paper to red. which of the following statements best explains this phenomenon?

• the dry litmus paper is too thick

• ethanoic acid is insoluble in water

• there are no free moving hydroxide ions formed

• there are no free moving hydrogen ions formed