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Chemistry · L4 · Back Titration: The Excess-and-Subtract Method · flowchart

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by @openstemUpdated Chemistry
Add a KNOWN, precisely measuredEXCESS of standard reagent ALet the reaction run to completion:A reacts fully with the analyteTitrate the LEFTOVER unreactedexcess of A with standard solution BCalculate moles of A consumedby B: n = C x VSubtract: moles A added minusmoles A leftover = moles A thatreacted with the analyteApply reaction stoichiometry to findmoles / mass / % purity of the analyte

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