10 Pack Unknown Composition Potassium Hydrogen Phthalate Samples, 100g Each, Varying Purities 20 65% Lab Supplies_Rulers & Measuring Supplies Physics teacher's Newton platform scale Physics teacher's Newton platform scale rated to 1275 newtons across a 10 Reagent grade granular ammonium chloride for analytical chemistry this 10 pack of 100g potassium hydrogen phthalate samples ranges 20 65% purity for analytical chemistry practice Used to challenge students in determining purity by titration of unknowns
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