Why is a standard KCl solution used to determine the cell constant, instead of the cell's...
Why is a standard KCl solution used to determine the cell constant, instead of the cell's dimensions? Is it more accurate? If so, why?
Thank you
Homework Answers
Manual measurement of length and area of the electrode is pretty vague and you end up in error. The measurements are not that accurate. Hence we use standard KCl solution to calibrate the conductivity cell. This helps you to measure the resistance of known solution which will then helps you to find exactly the cell constant l/A where l= length and A is the area of the electrode.
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Why is a standard KCl solution used to determine the cell
constant, instead of the cell's...
A standard solution of KCl is known to have a conductivity of κ=1.06296 x 10-8 S...
A standard solution of KCl is known to have a conductivity of κ=1.06296 x 10-8 S cm-1 and is used to standardise a conductance cell. A resistance reading, R of 4.2156 Ω is given. Calculate the cell constant, k showing all working. The same cell is then filled with a solution of HCl and a resistance of 1.0326 Ω is measured. Calculate the conductivity of this solution in S cm-1 showing all working.
A standard saline solution used for intravenous drips in hospitals is 0.90% weight per volume (instead...
A standard saline solution used for intravenous drips in hospitals is 0.90% weight per volume (instead of mass), or 9.000 . What is the molarity of this solution?
Please let me know the answer and why. Thank You! 41.0 g of KCl is dissolved...
Please let me know the answer
and why. Thank You!
41.0 g of KCl is dissolved into 100 mL of water at 25°C and constant pressure in a constant pressure calorimeter. What is the temperature of the final solution after the solid is completely dissolved? Assume (= 4.18 J/gºC for the solution. The density of water is 1 g/mL. KCI (aq) K (aq) + C1- (aq) AH = +17.2 kJ/mol A) 7.01 °C B) 11.4 °C 0 C) 10.1 °C...
1. You made a 0.3% KCl solution in Professor Fiorni’s lab but need to determine the...
1. You made a 0.3% KCl solution in Professor Fiorni’s lab but need to determine the Molarity of it for a paper. (MW of KCl is 74.55 g/mol) 2. You are working as a research technician for Pfizer and in your lab, one solution of hydrochloric acid has a pH of 3.2, while another solution of sodium hydroxide has a pH of 9.7. Calculate the concentration of hydrogen ions in each solution.
6. Consider the following electrochemical cell: Write electrode half-reactions and the cell reaction. Determine the standard...
6. Consider the following electrochemical cell: Write electrode half-reactions and the cell reaction. Determine the standard emf E for this cell from standard potential data in the Data Section of your textbook. Calculate the standard Gibbs energy and the equilibrium constant for the cell reaction at 25°C. Write the Nernst equation for the cell and calculate its emf E given that the pressure of H:(g) p = 1 bar, the molality of HCI(aq) b = 0.01 mol kg.. and the...
1) Instead of using zinc, a student accidentally used a 1 M solution of silver (Ag)....
1) Instead of using zinc, a student accidentally used a 1 M solution of silver (Ag). Based on the information in the table below, what would be the theoretical cell voltage, Eocell, when it is used in a galvanic cell with copper?
please help! thank you The standard hydrogen electrode (SHE) is used to produce a standard cell...
please help! thank you
The standard hydrogen electrode (SHE) is used to produce a standard cell potential of exactly 1 V. the reference point for all standard reduction potentials. often overlooked in measuring standard reduction potentials. used to calibrate voltmeters. needed to activate electrochemical cells. The solubility product for Ag2S is written as where s is the molar solubility, Ksp = 3² Ksp - 443 Ksp - 45² Кsp 2s2 Кsp 253
O. s 2. The tollowing cell is used to determine the concentration of So SCE SO (M, HgSO (saturate...
O. s 2. The tollowing cell is used to determine the concentration of So SCE SO (M, HgSO (saturated)Hg The potential measured in the cell is-0.537V (room temperature). Calculate concentration of SO potential E for HE is 0.244V, The standard Electrode potenial of SCE vs. S
O. s 2. The tollowing cell is used to determine the concentration of So SCE SO (M, HgSO (saturated)Hg The potential measured in the cell is-0.537V (room temperature). Calculate concentration of SO potential E...
Why is ATP the major energy currency of the cell, instead of GTP? Select one: a....
Why is ATP the major energy currency of the cell, instead of GTP? Select one: a. We don’t know. Either molecule could fill this role. b. Adenine is more common in the environment. c. ATP is higher in energy than GTP. d. None of the above are true. e. All of the above are true.
What would happen to the measured cell potentials if 30 mL solution was used in each...
What would happen to the measured cell potentials if 30 mL solution was used in each half-cell instead of 25 mL?
Please let me know the answer
and why. Thank You!
41.0 g of KCl is dissolved into 100 mL of water at 25°C and constant pressure in a constant pressure calorimeter. What is the temperature of the final solution after the solid is completely dissolved? Assume (= 4.18 J/gºC for the solution. The density of water is 1 g/mL. KCI (aq) K (aq) + C1- (aq) AH = +17.2 kJ/mol A) 7.01 °C B) 11.4 °C 0 C) 10.1 °C...
6. Consider the following electrochemical cell: Write electrode half-reactions and the cell reaction. Determine the standard emf E for this cell from standard potential data in the Data Section of your textbook. Calculate the standard Gibbs energy and the equilibrium constant for the cell reaction at 25°C. Write the Nernst equation for the cell and calculate its emf E given that the pressure of H:(g) p = 1 bar, the molality of HCI(aq) b = 0.01 mol kg.. and the...
please help! thank you
The standard hydrogen electrode (SHE) is used to produce a standard cell potential of exactly 1 V. the reference point for all standard reduction potentials. often overlooked in measuring standard reduction potentials. used to calibrate voltmeters. needed to activate electrochemical cells. The solubility product for Ag2S is written as where s is the molar solubility, Ksp = 3² Ksp - 443 Ksp - 45² Кsp 2s2 Кsp 253
O. s 2. The tollowing cell is used to determine the concentration of So SCE SO (M, HgSO (saturated)Hg The potential measured in the cell is-0.537V (room temperature). Calculate concentration of SO potential E for HE is 0.244V, The standard Electrode potenial of SCE vs. S
O. s 2. The tollowing cell is used to determine the concentration of So SCE SO (M, HgSO (saturated)Hg The potential measured in the cell is-0.537V (room temperature). Calculate concentration of SO potential E...
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