10. Determine the concentration of NaCl in the solution (g/1) , if the following results were obtained during potentiometric titration of 20.0 ml of a solution of 0 .2000 M AgNO_(3) 11. Determine the concentration of cadmium in the solution if D=0.7210^-5cm^2s^-1,m=2.0 mg/s,tau =4.4 s, and the current strength is 10mu A 12. The molar absorption coefficien t of silver in a complex with dithizone in solution at 462 nm is 30500 the minimum concentration in mol/1 of the complex of silver with dithizone, which can be determined by the photometric method at an absorbing layer thickness of 1=1 cm, if the minimum optical density recorded by the device is equals 0.01 .

10. To determine the concentration of NaCl in the solution, we can use the concept of stoichiometry and the balanced chemical equation for the reaction between NaCl and AgNO3.<br /><br />The balanced chemical equation for the reaction is:<br />NaCl + AgNO3 → NaNO3 + Ag<br /><br />Given that the volume of the AgNO3 solution is 20.0 mL and its concentration is 0.2000 M, we can calculate the number of moles of AgNO3 using the formula:<br /><br />Moles of AgNO3 = Concentration of AgNO3 × Volume of AgNO3 solution<br />Moles of AgNO3 = 0.2000 M × 0.020 L<br />Moles of AgNO3 = 0.004 mol<br /><br />Since the reaction is a 1:1 stoichiometry, the number of moles of NaCl will be equal to the number of moles of AgNO3.<br /><br />Moles of NaCl = Moles of AgNO3<br />Moles of NaCl = 0.004 mol<br /><br />To calculate the concentration of NaCl in the solution, we can use the formula:<br /><br />Concentration of NaCl = Moles of NaCl / Volume of solution<br />Assuming the volume of the solution is 1 L, the concentration of NaCl would be:<br /><br />Concentration of NaCl = 0.004 mol / 1 L<br />Concentration of NaCl = 0.004 M or 4 g/L<br /><br />Therefore, the concentration of NaCl in the solution is 4 g/L.<br /><br />11. To determine the concentration of cadmium in the solution, we can use the formula for the diffusion coefficient:<br /><br />D = (m × τ) / (I × R)<br /><br />Where:<br />D = Diffusion coefficient (cm^2/s)<br />m = Mass transfer rate (mg/s)<br />τ = Time (s)<br />I = Current strength (A)<br />R = Resistance (Ω)<br /><br />Given the values:<br />D = 0.7210^-5 cm^2/s<br />m = 2.0 mg/s<br />τ = 4.4 s<br />I = 10 μA = 10^-8 A<br /><br />We can rearrange the formula to solve for the concentration of cadmium:<br /><br />Concentration of cadmium = (m × τ) / (D × I)<br /><br />Substituting the given values:<br /><br />Concentration of cadmium = (2.0 mg/s × 4.4 s) / (0.7210^-5 cm^2/s × 10^-8 A)<br />Concentration of cadmium = 1.176 × 10^11 mg/L<br /><br />Therefore, the concentration of cadmium in the solution is 1.176 × 10^11 mg/L.<br /><br />12. To calculate the minimum concentration of the complex of silver with dithizone, we can use the Beer-Lambert law:<br /><br />A = ε × c × l<br /><br />Where:<br />A = Absorbance<br />ε = Molar absorption coefficient (L·mol^-1·cm^-1)<br />c = Concentration (mol/L)<br />l = Path length (cm)<br /><br />Given the values:<br />ε = 30500 L·mol^-1·cm^-1<br />A = 0.01<br />l = 1 cm<br /><br />We can rearrange the formula to solve for the concentration:<br /><br />c = A / (ε × l)<br />c = 0.01 / (30500 × 1)<br />c = 3.278 × 10^-7 mol/L<br /><br />Therefore, the minimum concentration of the complex of silver with dithizone that can be determined by the photometric method is 3.278 × 10^-7 mol/L.