Industrial Chemicals · Calculate & Specify
Dilution and concentration arithmetic
This calculator solves concentration and quantity relationships using values you have verified yourself. It works on one declared basis at a time and refuses to convert between bases without data you enter. It calculates quantities. It is not a preparation method and it does not tell you how to make anything.
Mode
Each mode is a distinct arithmetic relation. Nothing is defaulted.
Your verified values
Enter only values you have confirmed yourself.
Result
Both concentrations stated on % w/w (mass fraction). Quantities in kg.
- Enter every required value. No value is defaulted or assumed.
THIS TOOL CALCULATES QUANTITIES ONLY. IT DOES NOT PROVIDE MIXING OR HANDLING INSTRUCTIONS.
Actual preparation may involve heat generation, corrosivity, chemical incompatibility, materials of construction, ventilation, personal protective equipment, site procedures.
Consult the current SDS, the manufacturer's instructions and a qualified technical procedure before any physical preparation.
Assumptions and limitation
- Both concentrations are on the same declared basis, as entered.
- Quantities are treated as additive for the arithmetic difference only.
- No density, molar mass or conversion factor has been applied.
This is arithmetic on the values you entered. It does not account for volume change on mixing, temperature, heat of dilution, material compatibility or anything else about physical preparation.
Worked example (hypothetical values only)
A hypothetical stock stated at 50% w/w. A hypothetical target of 10% w/w. A hypothetical final quantity of 200 kg. None of these figures represents any real product or offer.
- Q1 = (C2 × Q2) ÷ C1 = (10 × 200 kg) ÷ 50 = 40 kg of stock.
- Diluent quantity by difference = 200 kg − 40 kg = 160 kg.
- Active mass check = 40 kg × 0.50 = 20 kg active, and 200 kg × 0.10 = 20 kg active.
The arithmetic balances because both concentrations were stated on the same mass basis. It says nothing about how such a solution would be prepared.
Use this when
- You need the quantity of a stock solution that carries a required amount of active material.
- You are checking a written make-down quantity against the arithmetic.
- You need to express a required active mass as an as-supplied product quantity.
- You want the working shown so a colleague can verify the numbers.
How this works
- 1. Choose a mode and state the concentration basis you are working on.
- 2. Enter only values you have verified from your own documents.
- 3. The formula, the substitution and the result are displayed together.
- 4. Bases are never mixed silently — a conversion that needs density or molar mass is blocked unless you supply it.
What this page does not determine
- It calculates quantities only. It does not provide mixing, addition-order or handling instructions.
- It does not state that any calculated concentration is safe, suitable or achievable in your equipment.
- It applies no default density, molar mass or concentration; a missing value blocks the calculation.
- It does not convert between w/w, w/v, v/v, molarity or normality without a value you enter.
- Where actual handling is involved, work from the current SDS, the manufacturer's instructions, your own site procedures and qualified technical or engineering review.
Relevant Allzone products
These are catalogue identities relevant to investigate. A listing here is not a recommendation to use the material in any process, and it is not a suitability, safety or compliance claim.
- Caustic Soda Flakes & PearlsSolid sodium hydroxide supplied at a stated assay; the same chemical is also traded as a solution at a different basis.
- Sulfuric AcidTraded at several concentrations; the quoted strength defines the as-supplied basis of the offer.
- Hydrochloric Acid (Muriatic)Solution acid quoted at a stated % HCl; two offers are only comparable at the same declared strength.
- Hydrogen PeroxideTraded at several declared concentrations with stabiliser packages stated on the data sheet.
- Sodium HypochloriteSolution quoted either as % available chlorine or as trade percent — different declared bases.
- Citric Acid Anhydrous & MonohydrateTwo distinct hydrate identities; the water of crystallisation changes the active basis per kilogram.
Where this comes from, and what it cannot tell you
The dilution relation C1 × Q1 = C2 × Q2 on a single consistent basis
Supports: Quantity and concentration relationships when both concentrations use the same declared basis.
Limitation: The relation holds arithmetically. It does not account for volume change on mixing, temperature or heat effects.
Application-independent · Arithmetic identity
Mass-fraction arithmetic (active mass = mass × mass fraction)
Supports: Converting between as-supplied product quantity and active material quantity.
Limitation: Valid only for mass-basis inputs; volume bases require a density value you supply.
Application-independent · Arithmetic identity
Related knowledge & tools
- Chemical Strength & Active-Basis ComparatorEstablish the active basis of each material before running dilution arithmetic.
- Industrial Chemical Specification & Documentation GuideWhere the concentration basis and density values you enter should come from.
- Industrial Chemicals KnowledgeChoose and compare, learn and specify, calculate.