Mass Flow Rate given Diffusion Current Calculator

Mass Flow Rate Formula:

\[ m_r = \left( \frac{I_d}{607 \times n \times D^{1/2} \times t^{1/6} \times c} \right)^{3/2} \]

Diffusion Current (I_d):

No. of Electrons (n):

Diffusion Coefficient (D):

m²/s

Time for Dropping Mercury (t):

Concentration (c):

mol/m³

Mass Flow Rate (m_r):

kg/s

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1. What is Mass Flow Rate in Ilkovic Equation?

Definition: Mass Flow Rate for Ilkovic Equation is defined as the mass of liquid mercury passing per unit time in polarographic measurements.

Purpose: It's a crucial parameter in polarography that affects the diffusion current measured at the dropping mercury electrode.

2. How Does the Calculator Work?

The calculator uses the Ilkovic equation:

\[ m_r = \left( \frac{I_d}{607 \times n \times D^{1/2} \times t^{1/6} \times c} \right)^{3/2} \]

Where:

\( m_r \) — Mass flow rate (kg/s)
\( I_d \) — Diffusion current (A)
\( n \) — Number of electrons exchanged
\( D \) — Diffusion coefficient (m²/s)
\( t \) — Time for dropping mercury (s)
\( c \) — Concentration (mol/m³)

Explanation: The equation relates the mass flow rate of mercury to the measured diffusion current and other experimental parameters.

3. Importance of Mass Flow Rate Calculation

Details: Accurate determination of mass flow rate is essential for correct interpretation of polarographic data and for quantitative analysis.

4. Using the Calculator

Tips: Enter the diffusion current in amperes, number of electrons (integer), diffusion coefficient in m²/s, drop time in seconds, and concentration in mol/m³. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical value range for mass flow rate?
A: Typically ranges from 10^-15 to 10^-12 kg/s for standard polarographic measurements.

Q2: Why is the diffusion coefficient important?
A: It determines how quickly the analyte moves to the electrode surface, affecting the current.

Q3: How accurate is this calculation?
A: It provides good estimates when experimental conditions match the assumptions of the Ilkovic equation.

Q4: What affects the drop time of mercury?
A: Capillary dimensions, mercury pressure, and solution properties all influence drop time.

Q5: Can I use this for non-mercury electrodes?
A: No, this equation is specific to dropping mercury electrode systems.