04_Titrimetry-page5

04_Titrimetry-page5 - Equivalent weight Formula Weight Eq...

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Unformatted text preview: Equivalent weight Formula Weight Eq Wt = # equivalents/mole Determining the number of equivalents in a mole requires that you know the type of reaction and how the species involved actually combine In other words - you already know R If the normality of your titrant and the equivalent weight of your analyte is known, your calculations are simpler. NAVA = NBVB = equivalentsB %B = mlA NA eq wtB 100 mg sample Realistically, you still need to know R so you can use either type of calculations. Parts per million and parts per billion These are extensions of the % system which are used for very dilute solutions ppm = ppb = wt solute wt solution wt solute wt solution x 106 x 109 ...
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