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Sodium hydride (NaH) reacts with water as follows - VCE - SSCE Chemistry - Question 7 - 2005 - Paper 1
Question 7
Sodium hydride (NaH) reacts with water as follows. NaH(s) + H2O(l) → Na+(aq) + OH−(aq) + H2(g) This reaction should be classified as A. acid-base but not redox. B.... show full transcript
Worked Solution & Example Answer:Sodium hydride (NaH) reacts with water as follows - VCE - SSCE Chemistry - Question 7 - 2005 - Paper 1
Step 1
This reaction should be classified as
Answer
To determine the classification of the reaction, we analyze the reactants and products:
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Identify Acid-Base Behavior: In this reaction, sodium hydride (NaH) donates a hydride ion (H⁻) to water, producing hydroxide ions (OH⁻). This indicates that NaH acts as a base, making this reaction an acid-base reaction.
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Identify Redox Behavior: A redox reaction involves the transfer of electrons, leading to changes in oxidation states. Here, sodium hydride contributes to the production of hydrogen gas (H₂) and does not change the oxidation states of the involved atoms (Na remains +1, H in OH⁻ is -1, and H in H₂ is 0).
Thus, since this reaction involves an acid-base reaction but no change in oxidation state, it is classified as both an acid-base and a redox reaction.