A electrode is an ion selective electrode that responds only to changes in the [H^ +...
Homework Answers
FALSE.
Ion-selective electrodes are highly selective in nature and can analyse the change in the activity(/concentration) of only one ion at a time, it can determine the change for both positively and negatively chared ions.
Hence saying this that it responds only to change in [H+] is FALSE
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A electrode is an ion selective electrode that responds only
to changes in the [H^ +...
An ammonium ion selective electrode exhibits interference from lithium ions with a selectivity coefficient of 0.2....
An ammonium ion selective electrode exhibits interference from lithium ions with a selectivity coefficient of 0.2. If a 0.10 M solution of ammonium has an electrode potential of 0.125 V what is the expected potential in a solution containing both 0.1 M ammonium and 0.1 M lithium? Recall that the Nernst equation for a cation selective electrode with interferent is Ecell L'002 Logho(a + Kb) where a and b are the activities(-concentrations) of the selective ion and interfering ion, respectively.
7) An ion selective electrode and reference electrode pair were placed in 100.00 mL of the...
7) An ion selective electrode and reference electrode pair were placed in 100.00 mL of the sample, and a reading of 21.6 mV was obtained. After the addition of 10.00 mL of a standard solution with a concentration of 100 ug/mL, the electrode pair gave a reading of 43.7 mV. The response slope (i.e., the slope of the line give by the equation E=mx+ constant, where x = log[ion]) was previously determined to be 57.8 mV. What is the sample...
The selectivity coefficient, KL.H' for a Li + ion selective electrode is 4 × 104, when...
The selectivity coefficient, KL.H' for a Li + ion selective electrode is 4 × 104, when the electrode is placed in 3.44 × 10-4 mol L-1 Li+ solution at pH 7.2, the potential is -0.333 V versus a saturated calomel electrode. What would be the potential if the pH were lowered to 1.1 and the ionic strength was kept constant?
A nitrate ion selective electrode is calibrated versus a Ag/AgCl reference electrode with a series of...
A nitrate ion selective electrode is calibrated versus a Ag/AgCl reference electrode with a series of standards, producing the graph shown, including the regression equation. Is the slope within 10% of the expected value? (Yes, No or there is no 'expected value) Is the intercept within 10% of the expected value? (Yes, No or there is no 'expected' value) Calculate the molar concentration of NO3' in a solution which gives a potential of 38.4 mV (also using the same Ag/AgCl...
A standard 0.0206 M solution of Nat is required to calibrate an ion-selective electrode method to...
A standard 0.0206 M solution of Nat is required to calibrate an ion-selective electrode method to determine sodium. Calculate how many grams of primary standard Na2Co3 (105.99 g/mol) are needed to prepare 474.6 mL of solution. (Units required. Case sensitive)
7. (10 points) a) The selectivity coefficient for a Bromide ion-selective electrode is on 0.15. What...
7. (10 points) a) The selectivity coefficient for a Bromide ion-selective electrode is on 0.15. What will the change in the electrode potential be for a 1.4 x 10" M Br" at pH 5.5 if the pH is raised to pH 11.0? b) A PH probe is calibrated against pH 4 and pH 7 buffers. For pH 4 buffer, E = 200 mV and for pH 7 buffer, E = 23 mV. If the potential for an unknown solution is...
A lithium ion-selective electrode gave the potentials given in the table below for the following standard...
A lithium ion-selective electrode gave the potentials given in the table below for the following standard solutions of LiCl and two samples of unknown concentration Solution ([Li+]/M) Potential vs. SCE, mV 0.100 M +1.0 0.050 M -30.0 0.010 M -60.0 0.001 M -138.0 Unknown 1 -48.5 Unknown 2 -75.3 Draw a calibration curve of the electrode potential versus log[Li+] and determine if the electrode is displaying nernstain behaviour. Use a linear least squares procedure to determine the concentration of the...
When an ion-selective electrode for X was immersed in 0.0680 M XCl, the measured potential was...
When an ion-selective electrode for X was immersed in 0.0680 M XCl, the measured potential was 0.0220 V. What is the concentration of X when the potential is 0.0370 V? Assume that the electrode follows the Nernst equation, the temperature is at 25
Analytical Chemistry: 23. What would be the ideal slope for an ion selective electrode at 25℃...
Analytical Chemistry: 23. What would be the ideal slope for an ion selective electrode at 25℃ for the following ions a. Cl- b. Fe3+
When an ion‑selective electrode for X+ was immersed in 0.0709 M XCl, the measured potential was...
When an ion‑selective electrode for X+ was immersed in 0.0709 M XCl, the measured potential was 0.0430 V . What is the concentration of X+ when the potential is 0.0580 V ? Assume that the electrode follows the Nernst equation, the temperature is at 25 °C, and that the activity coefficient of X+ is 1.
An ammonium ion selective electrode exhibits interference from lithium ions with a selectivity coefficient of 0.2. If a 0.10 M solution of ammonium has an electrode potential of 0.125 V what is the expected potential in a solution containing both 0.1 M ammonium and 0.1 M lithium? Recall that the Nernst equation for a cation selective electrode with interferent is Ecell L'002 Logho(a + Kb) where a and b are the activities(-concentrations) of the selective ion and interfering ion, respectively.
7) An ion selective electrode and reference electrode pair were placed in 100.00 mL of the sample, and a reading of 21.6 mV was obtained. After the addition of 10.00 mL of a standard solution with a concentration of 100 ug/mL, the electrode pair gave a reading of 43.7 mV. The response slope (i.e., the slope of the line give by the equation E=mx+ constant, where x = log[ion]) was previously determined to be 57.8 mV. What is the sample...
The selectivity coefficient, KL.H' for a Li + ion selective electrode is 4 × 104, when the electrode is placed in 3.44 × 10-4 mol L-1 Li+ solution at pH 7.2, the potential is -0.333 V versus a saturated calomel electrode. What would be the potential if the pH were lowered to 1.1 and the ionic strength was kept constant?
A nitrate ion selective electrode is calibrated versus a Ag/AgCl reference electrode with a series of standards, producing the graph shown, including the regression equation. Is the slope within 10% of the expected value? (Yes, No or there is no 'expected value) Is the intercept within 10% of the expected value? (Yes, No or there is no 'expected' value) Calculate the molar concentration of NO3' in a solution which gives a potential of 38.4 mV (also using the same Ag/AgCl...
A standard 0.0206 M solution of Nat is required to calibrate an ion-selective electrode method to determine sodium. Calculate how many grams of primary standard Na2Co3 (105.99 g/mol) are needed to prepare 474.6 mL of solution. (Units required. Case sensitive)
7. (10 points) a) The selectivity coefficient for a Bromide ion-selective electrode is on 0.15. What will the change in the electrode potential be for a 1.4 x 10" M Br" at pH 5.5 if the pH is raised to pH 11.0? b) A PH probe is calibrated against pH 4 and pH 7 buffers. For pH 4 buffer, E = 200 mV and for pH 7 buffer, E = 23 mV. If the potential for an unknown solution is...
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