How many molecules of water are formed when sulfuric acid, H2SO4 (aq), is placed in a beaker containing aqueous potassium hydroxide?
当硫酸 H 2 SO 4 （aq）放入含有氢氧化钾水溶液的烧杯中时，会产生多少水分子？

Question

BlackTom AI · Accepted Answer

Sulfuric acid is diprotic, so each H2SO4 molecule can donate two protons (H+). Each proton is neutralized by one hydroxide ion (OH–) from KOH to form one water molecule.

1) Relevant concepts
- Acid–base neutralization: H+ + OH– → H2O.
- Diprotic acid: H2SO4 has two acidic protons, therefore can react with two OH– ions per acid molecule.
- Stoichiometry: balance chemical equation to find mole (and molecule) ratios.

2) Step-by-step reasoning and reaction
Write the molecular reaction with potassium hydroxide:
H2SO4 + 2 KOH → K2SO4 + 2 H2O

Ionic form (useful to see H+ and OH–):
H2SO4 → 2 H+ + SO4^2–
2 KOH → 2 K+ + 2 OH–
Combine and cancel spectator ions (K+ and SO4^2– are spectators):
2 H+ + 2 OH– → 2 H2O
Net ionic simplified per acid molecule:
H2SO4 + 2 OH– → SO4^2– + 2 H2O

3) Calculations / intermediate steps
- From the balanced equation, 1 mole H2SO4 produces 2 moles H2O.
- Converting to molecules: 1 molecule H2SO4 produces 2 molecules H2O (or 1 mol × Avogadro's number → 2 mol × Avogadro's number).

4) Why the correct answer is correct
Because sulfuric acid donates two protons and each proton reacts with one hydroxide to make one water molecule, one H2SO4 yields two H2O molecules upon complete neutralization by KOH.

5) Why other answers would be incorrect
- “1” would imply H2SO4 behaved as monoprotic (donating only one H+), which is incorrect for full neutralization.
- Any number greater than 2 (e.g., 3 or 4) would violate conservation of atoms and the stoichiometry of H2SO4 (only two acidic H atoms are available).

6) Conclusion
Therefore, assuming complete neutralization by KOH, one molecule of H2SO4 produces two molecules of water. This matches the provided answer: 2.

How many molecules of water are formed when sulfuric acid, H2SO4 (aq), is placed in a beaker containing aqueous potassium hydroxide? 当硫酸 H 2 SO 4 （aq）放入含有氢氧化钾水溶液的烧杯中时，会产生多少水分子？ Single choice

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