Give the equation for the reaction that occurs when sodium oxide reacts with hydrochloric acid.

Na2O(s) + 2HCl(aq) ➔ 2NaCl(aq) + H2O(l)

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Explain whether silicon dioxide is an acidic oxide or a basic oxide.

Silicon dioxide is an acidic oxide because it reacts with hot, concentrated alkalis such as sodium hydroxide.


The equation for this reaction is: SiO2(s) + 2NaOH(aq) ➔ Na2SiO3(aq) + H2O(l)

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Why is aluminium oxide known as an amphoteric oxide?

Because it reacts with both acids and alkalis.

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What is the equation, including state symbols, for the reaction of silicon dioxide with a hot, concentrated solution of sodium hydroxide?

SiO2(s) + 2NaOH(aq) ➔ Na2SiO3(aq) + H2O(l)


Na2SiO3 is called sodium silicate.

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Give the equation for the reaction between aluminium oxide and hydrochloric acid?

Al2O3(s) + 6HCl(aq) ➔ 2AlCl3(aq) + 3H2O(l)

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Give the equation for the reaction between aluminium oxide and hot, concentrated sodium hydroxide.

Al2O3(s) + 2NaOH(aq) + 3H2O(l) ➔ 2NaAl(OH)4(aq)


NaAl(OH)4 is called sodium aluminate.

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What is the equation for the reaction of phosphoric(V) acid with excess sodium hydroxide?

H3PO4(aq) + 3NaOH(aq) ➔ Na3PO4(aq) + 3H2O(l)


The reaction occurs in three stages, as each hydrogen of H3PO4 in turn reacts with a hydroxide ion and is replaced by a sodium ion.

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What is the equation for the reaction of sulfur dioxide with excess sodium hydroxide?

SO2(aq) + 2NaOH(aq) ➔ Na2SO3(aq) + H2O(l)


Na2SO3 is called sodium sulfite.

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