Back TitrationsWhen the substance cannot be titrated directly.ChemistryUsed for insoluble solids or slow reactions.1Add a known excess of reagentEnough to react completely with the sample.2Allow the reaction to completeWarming or standing, as required.3Titrate the unreacted excessWith a standard solution.4SubtractMoles reacted = moles added − moles remaining.5Apply the mole ratioTo find the original sample.TYPICAL USECalcium carbonate in an indigestion tabletInsoluble, so it cannot be titrated directlyDissolve in excess acid, titrate the leftover acidThe commonest error is forgetting to subtract. The titre measures whatdid NOT react with the sample.Back Titrationslearnposters.com
Back Titrations — printable physical science wall chart from LearnPosters. Free vector PDF, US Letter and A4.

Back Titrations, step by step

Used for insoluble solids or slow reactions.

  1. Add a known excess of reagentEnough to react completely with the sample.
  2. Allow the reaction to completeWarming or standing, as required.
  3. Titrate the unreacted excessWith a standard solution.
  4. SubtractMoles reacted = moles added − moles remaining.
  5. Apply the mole ratioTo find the original sample.

Typical use

  • Calcium carbonate in an indigestion tablet
  • Insoluble, so it cannot be titrated directly
  • Dissolve in excess acid, titrate the leftover acid

The commonest error is forgetting to subtract. The titre measures what did NOT react with the sample.

Questions about the Back Titrations poster

What’s on the Back Titrations poster?
5 numbered steps, with a full worked run-through. Used for insoluble solids or slow reactions. Add a known excess of reagent — Enough to react completely with the sample.; Allow the reaction to complete — Warming or standing, as required.; Titrate the unreacted excess — With a standard solution.; Subtract — Moles reacted = moles added − moles remaining.; Apply the mole ratio — To find the original sample.. The commonest error is forgetting to subtract. The titre measures what did NOT react with the sample.
Who is the Back Titrations poster for?
Back Titrations belongs to the Chemistry section rather than to a school year, because physical science is not something one grade owns. Anyone learning calculations can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the Back Titrations poster?
Add excess, titrate what is left, subtract. Three steps rather than one. A wall chart earns its place by being glanceable from where the work is happening, so Back Titrations belongs on the wall where that physical science work actually happens, within glancing distance, rather than filed away.
What other posters go with Back Titrations?
Atom Economy, Formula Summary and Concentration sit alongside Back Titrations in the Chemistry section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Atom EconomyFormula SummaryConcentration
Is the Back Titrations poster free to download and print?
Yes. Back Titrations downloads as a free PDF with no account, no email and no watermark, like everything else in the Chemistry section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Back Titrations poster print at?
Back Titrations is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Back Titrations loses nothing.Printing guide

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