C9 Reactions of Acids Flashcards
In terms of pH what is an acid?
with a pH less than 7
In terms of pH what is a neutral solution?
with a pH of 7
In terms of pH what is an alkali?
with a pH above 7
In terms of H+ ions what is an acid?
a substance that releases H+ ions when dissolved in water
How is the amount of H+ ions in a solution related to the pH?
the more H+ ions, the lower pH
How can you measure the pH of a substance?
litnus paper
universal indicator
pH probe
What colour does blue litnus paper become with an acid?
Red
What is a strong acid?
an acid where the molecules or ions completely ionise in water
What is a weak acid?
an acid where the molecules or ions partially ionise in water
What is a salt?
a compound formed when a metal ion takes the place of a hydrogen ion in an acid
metal + acid –>
salt + hydrogen
metal hydroxide + acid –>
salt + water
metal oxide + acid –>
salt + water
metal carbonate + acid –>
salt + water + carbon dioxide
What is a base?
substance that reacts with acids in neutralisation reactions