--- title: "Concentration and dilution calculations Template | MolDraw" url: https://www.moldraw.com/templates/labref-concentration-calcs/ description: "Concentration and dilution calculations template: Molarity, mmol, equivalents, C₁V₁ = C₂V₂, % w/v and ppm on one card, with three worked examples: a 0.100 M…" lang: en publisher: Scidart Academy generated: 2026-10-28 --- [MolDraw](https://www.moldraw.com/) › [Templates](https://www.moldraw.com/templates/) › [Lab reference cards](https://www.moldraw.com/templates/lab-reference-cards/) › Concentration and dilution calculations [Lab reference cards](https://www.moldraw.com/templates/lab-reference-cards/)Premium # Concentration and dilution calculations template ![Concentration and dilution calculations template: Molarity, mmol, equivalents, C₁V₁ = C₂V₂, % w/v and ppm on one card, with three worked examples: a 0.100 M solution, an acetylation set-up in mg and mL, and a stock dilution with saline in mol/L and ppm.](https://www.moldraw.com/templates/labref-concentration-calcs.webp) [Edit in MolDraw](https://www.moldraw.com/)Download with Pro Premium template. Preview and edit it free in MolDraw; downloading and exporting it is part of [MolDraw Pro](https://www.moldraw.com/pricing). Molarity, mmol, equivalents, C₁V₁ = C₂V₂, % w/v and ppm on one card, with three worked examples: a 0.100 M solution, an acetylation set-up in mg and mL, and a stock dilution with saline in mol/L and ppm. ## What the template shows - Concentration and dilution - The six formulas used every day at the bench, with worked examples - Molarity: c (mol/L) = n (mol) / V (L) · n (mmol) = c (M) × V (mL) - Moles from mass: n (mmol) = m (mg) / MW (g/mol) · neat liquid: V (mL) = m (g) / d (g/mL) - Equivalents: n(reagent) = equiv × n(limiting reagent) - Dilution: C₁V₁ = C₂V₂ (same units on both sides) - % w/v = g solute per 100 mL solution (1% w/v = 10 g/L) · % w/w = g per 100 g - ppm (dilute aqueous) = mg/L = µg/mL; ppb = µg/L · 1% w/v = 10 000 ppm - Example 1 · make 250 mL of 0.100 M NaCl - n = c × V = 0.100 mol/L × 0.250 L = 0.0250 mol - m = n × MW = 0.0250 mol × 58.44 g/mol = 1.461 g NaCl; dissolve and make up to the mark in a 250 mL volumetric flask. - Example 2 · acetylate 2.00 mmol benzylamine (limiting reagent) - Acetyl chloride - mmol = equiv × 2.00 mmol; mg = mmol × MW; mL = mg / (1000 × d). For Et₃N: 1.5 × 2.00 = 3.00 mmol; 3.00 × 101.19 = 303.6 mg; 303.6 / 726 = 0.418 mL. - Example 3 · dilute a stock, and convert % w/v to M and ppm - C₁V₁ = C₂V₂: V₁ = C₂V₂ / C₁ = (100 µM × 2.00 mL) / 10000 µM = 0.0200 mL = 20.0 µL of the 10.0 mM stock + 1.98 mL diluent. - 0.9% w/v saline = 9.0 g NaCl per litre; 9.0 g/L ÷ 58.44 g/mol = 0.154 M; 9.0 g/L = 9000 mg/L = 9000 ppm (w/v). - Work in mmol, mg and mL at the bench: the factors of 1000 cancel (mmol = mg / MW = M × mL). - Base equivalents on the limiting reagent, and use the purity or titre on the bottle (e.g. 60% NaH, titrated n-BuLi). - Weigh liquids under about 0.1 mL by mass rather than volume; syringes are least accurate at small volumes. - Make a stock solution when you need less than about 5 mg of a reagent, then take an aliquot. - Keep units identical on both sides of C₁V₁ = C₂V₂: 10 mM = 10 000 µM. - Every number in the worked examples is recomputed by the template check · every part of this card is editable Drawn with 23 atoms, 1 arrow, 9 shapes – every one editable in MolDraw. ## Sources - [CRC Handbook of Chemistry and Physics, 104th ed., CRC Press 2023](https://openlibrary.org/isbn/9781032655628) Textbook ## How to use this template 1. Press **Edit in MolDraw**. The template opens on the canvas of the free MolDraw editor. 2. Change anything: move structures, edit atoms and labels, recolour highlights or delete what you do not need. 3. Add your own structures, arrows and text next to it, or combine several templates on one page. 4. Export the drawing as PNG, SVG or PDF for slides, worksheets, theses and papers. ## Frequently asked questions ### Is the Concentration and dilution calculations template free? You can preview the Concentration and dilution calculations template here and open and edit it in MolDraw for free. Downloading or exporting it is part of MolDraw Pro, together with the other premium templates. ### Can I edit the Concentration and dilution calculations template? Yes. It opens as an ordinary MolDraw drawing, so every structure, arrow, label and colour can be changed, and you can add your own content around it. ### Is the chemistry checked? Every structure is checked with RDKit and every curly arrow passes MolDraw’s electron-flow audit. The sources used are listed on this page. ### What is on the solvent properties card? Boiling point, density, polarity and water miscibility of the common lab solvents. ## More lab reference cards templates [**Solvent properties card**Free · Lab reference cards](https://www.moldraw.com/templates/labref-solvents-table/)[**Reagent quick table**Free · Lab reference cards](https://www.moldraw.com/templates/labref-reagents-table/)[**TLC stains and visualisation**Free · Lab reference cards](https://www.moldraw.com/templates/labref-tlc-stains/)[**Drying agents and cooling baths**Premium · Lab reference cards](https://www.moldraw.com/templates/labref-drying-cooling/) ## Related pages [**TLC and Rf Values Worksheet**Free printable worksheet](https://www.moldraw.com/educational-materials/tlc-rf-worksheet/)[**Mole Concept and Stoichiometry Worksheet**Free printable worksheet](https://www.moldraw.com/educational-materials/mole-concept-stoichiometry-worksheet/)[**All Lab reference cards templates**5 templates](https://www.moldraw.com/templates/lab-reference-cards/)[**All chemistry templates**370 templates in 29 categories](https://www.moldraw.com/templates/) MolDraw Pro Download all 370 templates - Export the 291 premium templates as PNG, SVG or PDF - AI chemistry assistant - Structure scanning from images - Cloud save and teaching slides [See Pro plans](https://www.moldraw.com/pricing) Free templates stay free. 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