Determine the ionic strength of a minimal growth medium that has the following composition: 0.150 M HEPES (a weak acid), 0.0500 M NH4NO3, 0.0140 M MgCl₂, and 0.0240 M CaCl₂.
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- A conductivity cell has a resistance of 250 Ω when filled with 0.02 M KCl at 25°C and 105 Ω when filled with 6 x 10-5 M ammonium hydroxide solution. The conductivity of 0.02 M KCl solution at 25°C is 0.277 Sm-1, and the limiting molar ionic conductivities of NH4 + and OH- are 7.34 x 10-3 and 0.0198 S m2mol-1 , respectively. Calculate the cell constant and degree of dissociation of ammonium hydroxide in the 6 x 10-5 M solution.The large surface-to mass ratio of colloidal particles supports the goal of adsorption indicators, but the coagulation sometimes interferes with desired results. Explain how the coagulation is beneficial in gravimetric analysis but is detrimental to volumetric analysis.Calculate the ionic strength of a solution that is 0.040 mol kg−1 in K3[Fe(CN)6](aq), 0.030 mol kg−1 in KCl(aq), and 0.050 mol kg−1 in NaBr(aq).
- What Is The Activity Coefficient Of Benzoate Ion (C7H5O2-) With An Ionic Size Parameter Of a = 0.60 nm For 0.50 M Sodium Sulfate Solution?The mean activity coefficient of a 0.010 m H2SO4 solution is 0.544. What is its mean activity?Calculate the ionic strength of a solution that is 0.10 mol kg−1 in KCl(aq) and 0.20 mol kg−1 in CuSO4(aq).
- Consider the dissolution of A(OH)2 in a medium with [OH-] = 0.15 M. Construct an ICE table for the dissolution of A(OH)2 in this medium.In one trial of this experiment, graphing Ecell against ln Q for a series of copper/copper(I) concentration cells resulted in a line of best fit with a slope of –0.029 V. All measurements were carried out at a temperature of 296 K. What value of the ideal gas constant R is implied by this result? Enter your answer in J/mol·K to the nearest 0.01 J/mol·K.What is the strength of the ionic interactions between an ion with 1 positive charges and an ion with 2 negative charges, when the distance between them is 19.4 nanometers and the solvent is water, at 25 oC with a dielectric constant of 78.5?
- Why is high supersaturation undesirable in a gravimetric precipitation?Estimate the mean ionic activity coefficient of CaCl2 in a solution that is 0.010 mol kg−1 CaCl2(aq) and 0.030 mol kg−1 NaF(aq) at 25 °C.Calculate the ionic strength of a solution of iron (III) carbonate, Fe 2(CO3)3 of concentration 0.020 mol dm-3. a. 0.10 b. 0.25 c. 0.30 d. 0.02