Activity Series Reaction Calculator

Calculator Inputs

Solid Metal

Solution Type

Target Metal Ion

Solid Metal Mass (g)

Ion Concentration (mol/L)

Solution Volume (mL)

Temperature (°C)

Surface Condition

In dilute acid mode, the calculator compares the metal against hydrogen ions.

Example Data Table

Case	Solid Metal	Solution Type	Comparison Species	Expected Outcome	Why
1	Zn	Metal Ion Solution	Cu²⁺	Reaction predicted	Zinc is above copper in the series.
2	Cu	Metal Ion Solution	Zn²⁺	No reaction predicted	Copper is below zinc in the series.
3	Mg	Dilute Acid	H⁺	Reaction predicted	Magnesium is above hydrogen in the series.
4	Ag	Dilute Acid	H⁺	No reaction predicted	Silver is below hydrogen in the series.

Formula Used

This calculator uses the metal activity series as a screening rule. A more reactive solid metal can displace a less reactive metal ion from solution.

Decision rule for metal ion solutions:

Reaction predicted if rank(target ion metal) - rank(solid metal) > 0

Decision rule for dilute acid:

Reaction predicted if rank(H) - rank(solid metal) > 0

Activity gap:

Activity Gap = Target Rank - Solid Rank

Initial moles:

Metal moles = mass / molar mass

Ion moles = concentration × volume in liters

Stoichiometric extent:

Extent = minimum of (metal moles / metal coefficient) and (ion moles / ion coefficient)

The result is a practical screening estimate. Surface films, complex ions, concentration effects, and real electrochemical potentials can change laboratory behavior.

How to Use This Calculator

Select the solid metal you are testing.
Choose either metal ion solution or dilute acid mode.
Select the target ion if you use metal ion mode.
Enter metal mass, ion concentration, and solution volume.
Enter temperature and choose the surface condition.
Click Calculate Reaction to view the result above the form.
Review the balanced screening equation, limiting reagent, and estimated products.
Use the CSV or PDF buttons to save the result.

Frequently Asked Questions

1. What does the activity series show?

It ranks metals by relative reactivity. Metals higher in the list oxidize more easily and can usually displace lower metals from aqueous ionic solutions.

2. Why can zinc replace copper from solution?

Zinc is more reactive than copper. It loses electrons more readily, so copper ions can gain electrons and deposit as solid copper.

3. Why does silver usually not react with dilute acid?

Silver lies below hydrogen in the activity series. In this screening model, it cannot displace hydrogen ions from ordinary dilute acids.

4. Does concentration change the activity series order?

No. The order stays the same. Concentration can still affect how much reaction occurs and how quickly visible changes appear.

5. Why is surface condition included?

Oxide layers can block the metal surface. A metal may be thermodynamically favored yet appear slow because electron transfer is physically hindered.

6. Is this the same as a full electrochemical calculation?

No. This tool is a screening calculator. A full electrochemical analysis would use standard potentials, activities, complexation, and detailed conditions.

7. What does the activity gap mean?

It is the difference between target rank and solid rank. A positive gap means the solid metal is above the comparison species and should react.

8. Can this tool estimate product amount?

Yes. When reaction is predicted, it uses balanced coefficients, entered mass, concentration, and volume to estimate limiting reagent and product quantity.