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Barium hydroxide and sulfuric acid react according to the following equation: Ba(OH)₂(aq) + H₂SO₄(aq) → BaSO₄(s) + 2H₂O(l) (a) Name this type of chemical reaction - HSC - SSCE Chemistry - Question 21 - 2001 - Paper 1
Question 21
Barium hydroxide and sulfuric acid react according to the following equation: Ba(OH)₂(aq) + H₂SO₄(aq) → BaSO₄(s) + 2H₂O(l) (a) Name this type of chemical reaction.... show full transcript
Worked Solution & Example Answer:Barium hydroxide and sulfuric acid react according to the following equation: Ba(OH)₂(aq) + H₂SO₄(aq) → BaSO₄(s) + 2H₂O(l) (a) Name this type of chemical reaction - HSC - SSCE Chemistry - Question 21 - 2001 - Paper 1
Step 1
Name this type of chemical reaction.
Answer
The reaction between barium hydroxide and sulfuric acid is classified as a double displacement reaction, also known as a metathesis reaction. In this type of reaction, the positive and negative ions in the reactants exchange partners, resulting in the formation of new products.
Step 2
Explain the changes in conductivity shown by the graph.
Answer
In the beginning, as sulfuric acid is added to the barium hydroxide solution, the conductivity initially decreases. This is due to the neutralization reaction occurring, which reduces the concentration of free ions in the solution. As the barium sulfate precipitate forms, it removes some ions from the solution, leading to reduced conductivity.
Once the stoichiometric point is reached, excess sulfuric acid increases the conductivity again. The presence of additional H₂SO₄ adds more ions to the solution, enhancing conductivity as the reaction comes to completion.
Therefore, the graph reflects an initial decrease in conductivity followed by an increase as excess acid is added.