Question:
In Ilkovic equation, m determines
In Ilkovic equation, m determines
Show Hint
Ilkovic equation is central to classical polarography and is applied when using DME for quantitative electrochemical analysis.
Updated On: Jul 14, 2026
- Determine mass of analyte
- Determine mass of electron transfer
- Determine mass of mercury flow transfer
- Determine drop time
Show Solution
Verified By Collegedunia
The Correct Option is C
Approach Solution - 1
The Ilkovic equation is used in polarography to relate the diffusion current ($i_d$) to the concentration of electroactive species in solution. The equation is given as:
\[ i_d = 607 \, n D^{1/2} m^{2/3} t^{1/6} C \]
Where:
- \( i_d \) = diffusion current (in microamperes)
- \( n \) = number of electrons transferred
- \( D \) = diffusion coefficient of the analyte
- \( m \) = rate of mercury flow (mass flow rate)
- \( t \) = drop time of mercury from DME (dropping mercury electrode)
- \( C \) = concentration of the analyte
Here, \( m \) (sometimes represented as \( m' \)) specifically denotes the mass flow rate of mercury, which determines how much mercury is flowing out of the capillary per unit time during the polarographic analysis. This parameter affects the size and frequency of mercury drops and influences the current measured.
- \( n \) = number of electrons transferred
- \( D \) = diffusion coefficient of the analyte
- \( m \) = rate of mercury flow (mass flow rate)
- \( t \) = drop time of mercury from DME (dropping mercury electrode)
- \( C \) = concentration of the analyte
Here, \( m \) (sometimes represented as \( m' \)) specifically denotes the mass flow rate of mercury, which determines how much mercury is flowing out of the capillary per unit time during the polarographic analysis. This parameter affects the size and frequency of mercury drops and influences the current measured.
Was this answer helpful?
0
0
Show Solution
Verified By Collegedunia
Approach Solution -2
The question asks what the term m represents in the Ilkovic equation, which relates diffusion current in polarography to the properties of the dropping mercury electrode and the analyte. The equation is:
\[ i_d = 607\, n D^{1/2} m^{2/3} t^{1/6} C \]
Let's check each proposed meaning of m against the other symbols already defined in this equation.
- Determine mass of analyte: The amount of analyte present is represented by the concentration term C, not by m, so this option duplicates a role already assigned to a different symbol.
- Determine mass of electron transfer: The number of electrons transferred per analyte molecule is represented by n, not m. Electron transfer count and mercury flow rate are two completely different physical quantities.
- Determine mass of mercury flow transfer: The symbol m specifically stands for the mass flow rate of mercury from the capillary of the dropping mercury electrode, usually expressed in mg per second. This rate directly affects how quickly each drop grows and how much surface area is available for the reaction, which is why it appears in the diffusion current equation.
- Determine drop time: Drop time (how long each mercury drop takes to fall) is represented separately by the symbol t, which already appears in the equation as its own term.
Since n, C and t are already assigned to electron count, concentration and drop time respectively, the only quantity left for m to represent is the mercury flow rate.
Therefore, the correct answer is Determine mass of mercury flow transfer.
Was this answer helpful?
0
0
Top GPAT Pharmaceutics Questions
- Which of the following is an example of a thermosetting plastic material?
- Which of the following vehicles (not required to be sterile, but must be pyrogen free) is intended to be used in the manufacture of injectable products to be sterilized after preparation?
A typical skin cream consisting of stearic acid, potassium hydroxide, glycerin, water, preservative and perfume, would be commonly known as:
- Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The pressure filling method for filling pharmaceutical aerosol is usually preferred over cold filling method
Reason R: Because with pressure filling method high production speed can be achieved and less propellant is lost.
In light of the above statements, choose the correct answer from the options given below - Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: In the manufacturing of glycero‐gelatin suppositories, overfilling of mould is necessary.
Reason R: Glycero‐gelatin bases contract very little on cooling and the excess cannot be neatly removed.
In light of the above statements, choose the correct answer from the options given below
View More Questions
Top GPAT Questions
- Match the symbols in the List I with the terms used in the List II of conductance measurements, and
List I
SymbolsList II
TermsA \(\Omega^{-1}\) I Specific conductance B \(∧\) II Electrical conductance C k III Specific resistance D \(\rho\) IV Equivalent conductance
Choose the correct answer from the options given below: - Cottrell’s method is used for the measurement of:
- Match the statements in List I with their correct answers in List II, respectively, in respect to modified 1st law of thermodynamics, and
List I
List II
A Constant heat (q = 0) I Isothermal B Reversible process at constant temperature (dT = 0) II Isometric C Constant volume (dV = 0) III Adiabatic D Constant pressure (dP = 0) IV Isobar
Choose the correct answer from the options given below: - Boric acid with molecular weight 61.83 was partitioned between water and amyl alcohol at 25 °C. The amount of boric acid was determined to be 0.24 g in 250 ml of amyl alcohol and 0.32 g in 100 ml water. The partition coefficient of boric acid between water and amyl alcohol, when calculated at molar concentration for each of the solution, is:
- Drugs ‘A’, ‘B’ and ‘C’ follow zero order, first order and second order degradation kinetics, respectively, but have the same rate constant. Which of the following statement is true in this respect:
View More Questions