The molar conductance at infinite dilution of AgNO3,AgCl and MaCleod 116.5, 121.6 and 110 . The molar conductance of NaNO3?(Options) 111.4 ,,105.3,,130.6,,150.2

To determine the molar conductance of NaNO3 at infinite dilution, we can use the concept of molar conductance and the properties of ions in solution. Molar conductance at infinite dilution is a useful property because it allows us to understand how well a substance conducts electricity when fully dissociated into its ions. In this case, we have the molar conductance values for AgNO3, AgCl, and MaCleod, which can help us estimate the molar conductance of NaNO3.

Understanding Molar Conductance

Molar conductance (\( \Lambda_m \)) is defined as the conductance of an electrolyte solution divided by its molar concentration. At infinite dilution, each ion contributes to the overall conductance, and we can express the molar conductance of a compound as the sum of the contributions from its constituent ions.

Given Values

• AgNO3: 116.5 S cm²/mol
• AgCl: 121.6 S cm²/mol
• MaCleod: 110 S cm²/mol

Estimating Molar Conductance of NaNO3

To find the molar conductance of NaNO3, we can use the known values of the other salts as a reference. Sodium nitrate (NaNO3) dissociates into Na⁺ and NO3^- ions in solution. The molar conductance of NaNO3 can be approximated by considering the contributions of these ions.

We can use the following approach:

• Identify the contributions of Na⁺ and NO3^- ions based on the known conductance values.
• Estimate the molar conductance of NaNO3 by summing the contributions of its ions.

Ion Contributions

From the values provided, we can infer that the conductance of AgNO3 is influenced by the Ag⁺ and NO3^- ions. Similarly, AgCl involves Ag⁺ and Cl^-. The MaCleod value likely represents a different combination of ions. However, we can focus on the nitrate ion's contribution since it is common in both AgNO3 and NaNO3.

While we don't have the exact individual conductance values for Na⁺ and NO3^-, we can make an educated guess based on the average values of similar compounds. The conductance of Na⁺ is generally lower than that of Ag⁺, while the conductance of NO3^- is comparable to that of Cl^-.

Calculating NaNO3 Conductance

Assuming that the contributions of Na⁺ and NO3^- are similar to those of the ions in AgNO3, we can estimate:

• Na⁺ might contribute around 50-60 S cm²/mol.
• NO3^- could contribute similarly, around 60-70 S cm²/mol.

Adding these contributions gives us an estimated molar conductance for NaNO3:

Estimated Molar Conductance of NaNO3 = 50 + 60 = 110 S cm²/mol

Choosing the Closest Option

From the options provided (111.4, 105.3, 130.6, 150.2), the closest value to our estimate of 110 S cm²/mol is 105.3 S cm²/mol. Therefore, we can conclude that:

The molar conductance of NaNO3 at infinite dilution is approximately 105.3 S cm²/mol.