Year 13 - The acidic/basic nature of the Period 3 oxides Flashcards
Which of the period 3 oxides only react with acids?
The oxides of magnesium and sodium only react with acids to give salt and water.
Which of the oxides of period 3 can be described as ‘amphoteric’ and why?
Aluminium oxide can be described as amphoteric as it can react with both acids and alkalis.
How does silicon dioxide react?
It reacts as a weak acid with a strong base eg. hot concentrated sodium hydroxide.
Describe the reaction of phosphorous pentoxide.
The reaction of phosphorous pentoxide with an alkali is really the reaction of phosphoric (V) acid (H3PO4) as this is formed which phosphorous pentoxide reacts with water. Each of the three acidic hydrogen atoms it has will react with the sodium hydroxide in three stages, as in turn each hydrogen ion reacts with a hydroxide ion and is replaced by a sodium ion.
What would sulphur dioxide react as?
It would react as an acid eg if sodium hydroxide was added to it it would produce sodium hydrogensulfate (IV).
