Question:
20 mL of 0.02 M hypo solution is used for the titration of 10 mL of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of \(Cu^{2+}\) is found to be ________ × \(10^{–2} M\). [nearest integer]
20 mL of 0.02 M hypo solution is used for the titration of 10 mL of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of \(Cu^{2+}\) is found to be ________ × \(10^{–2} M\). [nearest integer]
Updated On: Dec 18, 2024
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Correct Answer: 4
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\(n_{eq.}\) of \(I_2\)=\(n_{eq}\) of \(Na_2S_2O_3\)=20×0.002×1
2×\(n_{mol}\) of \(I_2\)=0.4
\(n_{mol}\) of \(I_2\)=0.2 mmol
\(n_{mol}\) of \(Cu^{+2}\)=\(0.2×2×10^{−3}\)
\(Cu^{+2}\)=\(\frac{0.4×10^{−3}}{10×10^{−3}}\)=0.04=\(4×10^{−2}\)
2×\(n_{mol}\) of \(I_2\)=0.4
\(n_{mol}\) of \(I_2\)=0.2 mmol
\(n_{mol}\) of \(Cu^{+2}\)=\(0.2×2×10^{−3}\)
\(Cu^{+2}\)=\(\frac{0.4×10^{−3}}{10×10^{−3}}\)=0.04=\(4×10^{−2}\)
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Concepts Used:
Solutions
A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.
For example, salt and sugar is a good illustration of a solution. A solution can be categorized into several components.
Types of Solutions:
The solutions can be classified into three types:
- Solid Solutions - In these solutions, the solvent is in a Solid-state.
- Liquid Solutions- In these solutions, the solvent is in a Liquid state.
- Gaseous Solutions - In these solutions, the solvent is in a Gaseous state.
On the basis of the amount of solute dissolved in a solvent, solutions are divided into the following types:
- Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
- Saturated Solution- A solution in which no solute can be dissolved after reaching a certain amount of temperature is known as an unsaturated saturated solution.
- Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.