22.3 The acidic/basic nature of the period 3 oxides Flashcards
How does sodium oxide react with sulfuric acid
Write the equation
They react to give a salt and water because sodium oxide is a base
Na2O(s) + H2SO4(aq)–>
Na2SO4(aq) + H2O(l)
How does magnesium oxide react with Hydrochloric acid
Reacts to give a salt and water, the salt magnesium chloride because magnesium oxide is a base
MgO(s) + 2HCl(aq) –>
MgCl2(aq) + H2O(l)
How does aluminium oxide react with acids and bases
Write the equation of it with HCl
Write the equation of it with sodium hydroxide
It reacts with both acids and bases, so is an amphoteric oxide
Al2O3(s) + 6HCl —> 2AlCl3(aq) + 3H2O(l)
Al2O3(s) + 2NaOH(aq) + 3H2O(l)
–> 2NaAl(OH)4(aq)
How does silicon dioxide react with alkalis eg sodium hydroxide
It reacts as a weak acid with strong bases, eg with sodium hydroxide a colourless solution of sodium silicate is formed
Si(O2)(s) + 2NaOH(aq) –>
Na2SiO3(aq) +H2O(l)
How does phosphorus pentoxide (P4O10) react with an alkali eg sodium hydroxide
. The reaction of phosphorus pentoxide with an alkali is basically the reaction of phosphoric(V) acid (H3PO4)
. Because phosphorus pentoxide reacts with water
Phosphoric(V) acid has 3 OH- groups and each of these has an acidic hydrogen atom so it reacts with sodium hydroxide in 3 stages as each hydrogen atom in turn reacts with a hydroxide atom and is replaced with a sodium ion
What are the multiple equations for phosphorus pentoxide and sodium hydroxide
- H3PO4(aq) + NaOH(aq) –>
NaH2PO4(aq) + H2O(l) - NaH2PO4(aq) + NaOH(aq) –>
Na2HPO4(aq) + H2O(l) - Na2HPO4(aq) + NaOH(aq) —>
Na3PO4(aq) + H20
so the overall reaction:
3NaOH(aq) + H3PO4(aq)
—-> Na3PO4(aq) + 3H2O(l)
How does sulfur dioxide react with sodium hydroxide
Write the equation
First, sodium hydrogensulfate(IV) is formed
SO2(aq) + NaOH(aq) –>
NaHSO4(aq)
Followed by sodium sulfate(IV)
NaHSO4(aq) –> NaSO3(aq) + H2O(l)
