48. Solution to Chemistry Problem

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9.

• Calculate, arrange in a table and plot the dependences of specific, equivalent conductivity and degree of dissociation on concentration and dilution based on the data given in the table.
• Calculate the dissociation constants of the electrolyte for all concentrations and draw a conclusion about the subordination of the solutions to Ostwald's dilution law.
• Determine at what concentration the degree of dissociation of the substance in the solution is 0.1 and what is the pH of this solution.
• Calculate the change in Helmholtz energy (ΔF ) during dissociation.

For task options, see Tables 10-12.

Table 10

Task No.

C, mol/l 0.05 0.03 0.01 0.005 0.003 0.001 λ0.104 m2/Ohm.mol-eq

Substance

ρ (Ohm.m) at T=298 K

9 NH4OH 10.3 14.5 25.8 100 143 251 273

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