Calculator Inputs
Enter both stream values to compare molar feed, delivered moles, target ratio, and limiting behavior. Use positive numbers only.
Example Data Table
This worked example shows how the calculator interprets two infusion streams over equal durations.
| Case | A Molarity | A Flow | A Duration | B Molarity | B Flow | B Duration | Feed Ratio A:B | Total Moles |
|---|---|---|---|---|---|---|---|---|
| Reference Mix | 0.20 mol/L | 120 mL/h | 4 h | 0.10 mol/L | 80 mL/h | 4 h | 3.0000 : 1 | 0.1280 mol |
| Lean B Stream | 0.15 mol/L | 90 mL/h | 5 h | 0.12 mol/L | 60 mL/h | 5 h | 1.8750 : 1 | 0.1035 mol |
| Balanced Feed | 0.18 mol/L | 100 mL/h | 3 h | 0.09 mol/L | 200 mL/h | 3 h | 1.0000 : 1 | 0.1080 mol |
Formula Used
- Volumetric flow conversion: Q(L/h) = Q(mL/h) / 1000
- Molar feed rate: ṅ = M × Q, where M is molarity and Q is volumetric flow in L/h.
- Delivered moles: n = M × Q × t, where t is infusion duration in hours.
- Actual feed ratio: Ratio A:B = ṅA / ṅB
- Delivered ratio: Ratio A:B = nA / nB
- Normalized stoichiometric basis: (nA / a) : (nB / b), where a and b are stoichiometric coefficients.
- Combined solute concentration: Cmix = (nA + nB) / (VA + VB)
- Target deviation: ((Actual Ratio − Target Ratio) / Target Ratio) × 100
- Required B flow for a target ratio: QB = (ṅA / Target Ratio) / MB
- Required A flow for a target ratio: QA = (ṅB × Target Ratio) / MA
How to Use This Calculator
- Enter Stream A molarity, flow rate, and infusion duration.
- Enter Stream B molarity, flow rate, and infusion duration.
- Add stoichiometric coefficients if the comparison must follow a reaction or prescribed mixing proportion.
- Set the desired target ratio for A:B. This lets the tool measure deviation and estimate corrected flow rates.
- Choose how many decimal places you want in the final report.
- Click the calculate button. The result summary appears above the form and below the header.
- Review the table, chart, target deviation, and limiting stream before exporting the report.
Frequently Asked Questions
-
What does this calculator measure?
It compares two infusion streams using molarity, flow rate, and time. It returns molar feed rates, delivered moles, actual ratio, target deviation, mixed concentration, and limiting stream information. -
Why are both feed ratio and delivered ratio shown?
Feed ratio compares instantaneous molar input rates. Delivered ratio compares total moles infused across the chosen durations. They match only when timing and rate relationships stay proportional. -
What is the limiting stream?
The limiting stream is the one that supplies fewer stoichiometrically adjusted moles. The calculator evaluates nA/a and nB/b, then flags the smaller value as limiting. -
When should I change the stoichiometric coefficients?
Change them when the comparison should follow a fixed reaction or design proportion, such as 2:1 or 3:2. Leave both as 1 for a direct mole-to-mole comparison. -
How is combined solute concentration calculated?
The tool adds total delivered moles from both streams and divides by total delivered liquid volume. This gives a combined concentration on a shared mixed-volume basis. -
What do the required flow outputs mean?
They show what Stream A or Stream B flow would need to become, while holding the opposite stream fixed, to meet the selected target molar ratio. -
Can I use different infusion durations?
Yes. Different durations affect delivered moles and total volume. They may also cause the delivered ratio to differ from the live feed ratio. -
Do exported CSV and PDF files contain the chart?
The CSV includes the full result table. The PDF includes a neat text summary of the result table. The chart remains visible on the web page for review.