Answer:
958 g
Explanation:
solution = solute + solvent
1000 g = 42.0 g + solvent
solvent = 1000 - 42.0 = 958 g
N(Cu) = 7.8x10^21/6.02x10^23
n(Cu)=0.013moles of copper
Answer:
Balanced net ionic equation;
2MnO₄⁻ + 16H⁺ + 5C₂O₄²⁻ → 2Mn²⁺ + 8H₂O + 10 CO₂
Explanation:
- This is an example of a redox titration where acidified potassium permanganate (KMnO₄) is titrated against oxalic acid (H₂C₂O₄).
- A redox reaction is a type of reaction that involves both reduction and oxidation.
- One reactant of the reaction gains electrons(reduction) while another loses electrons(oxidation).
- During the redox reaction, H⁺/KMnO₄ undergoes reduction while the oxalic acid undergoes oxidation.
- Therefore, KMnO₄ is the oxidizing agent while H₂C₂O₄ is the reducing agent.
- The net ionic reaction will be;
2MnO₄⁻ + 16H⁺ + 5C₂O₄²⁻ → 2Mn²⁺ + 8H₂O + 10 CO₂
- From the reaction, MnO₄⁻ is reduced to 2Mn²⁺ while C₂O₄²⁻ is oxidized to CO₂.
- Therefore, two moles of KMnO₄ will react with 5 moles of oxalic acid.
An accepted and universally true explanation of observed facts is a law.
