Virtual Labs

a: SO₄²⁻ b: Cu²⁺ c: S₂O₃²⁻ d: Na⁺

a: Methyl orange b: Starch c: Phenolphthalein d: Litmus

a: To oxidize the thiosulfate b: To reduce the copper ion c: To form a complex with copper ion d: To form iodine which then reacts with thiosulfate

a: 1:1 b: 2:1 c: 3:1 d: 1:2

a: When the solution turns blue b: When the solution turns colorless c: When the solution turns yellow d: When the solution turns red

a: I₂ + 2S₂O₃²⁻ → 2I⁻ + S₂O₆²⁻ b: I₂ + 2S₂O₃²⁻ → 2I⁻ + S₂O₄²⁻ c: I₂ + S₂O₃²⁻ → 2I⁻ + SO₄²⁻ d: I₂ + 2S₂O₃²⁻ → 2I⁻ + S₄O₆²⁻

a: It indicates the presence of thiosulfate ion b: It indicates the presence of copper ion c: It indicates the presence of iodine d: It indicates the end point of the titration

a: By using the volume of thiosulfate solution used b: By using the initial concentration of CuSO₄ c: By using the initial volume of CuSO₄ solution d: By using the mass of CuSO₄

a: To ensure accurate concentration measurement b: To change its pH c: To mix it properly with CuSO₄ d: To increase its volume

a: To determine the strength of an unknown solution of CuSO₄ b: To measure the pH of CuSO₄ solution c: To calculate the density of CuSO₄ solution d: To change the color of CuSO₄ solution

Determination of the strength of an unknown CuSO₄ solution