Educators agree that students need measuring sticks to calibrate their equipment and volumetric standards. U.S. Bureau of Standards reference standards are excellent but very expensive. Some commercial standards are satisfactory, but others are not. To give students reference standards of accuracy matching that of unknowns, Thorn Smith produces Student Reference Standards. Side-by-side analysis of these standards with Thorn Smith unknowns gives agreement of a few parts per ten thousand for many materials. Matching these accuracies provides a real challenge to even your best students.
NOTE: Materials marked (Highly Toxic) will be shipped in Poison Packs at extra charge.
|Catalog #||Material (MSDS info)||Price|
Arsenious acid - for standardizing iodine
|100 gram: $14.80 500 gram: $58.30|
Calcium carbonate - for standardizing EDTA solution
|100 gram: $14.50 500 gram: $56.10|
Ferrous ammonium sulfate - for standardizing dichromate or permanganate solution
|100 gram: $14.85 500 gram: $57.70|
Potassium biphthalate - for standardizing sodium hydroxide solution
|100 gram: $18.75 500 gram: $68.95|
Potassium dichromate - for standardizing thiosulfate solution
|100 gram: $13.50 500 gram: $52.00|
Silver nitrate ACS grade
Shipped in Poison Packs*
Note: Prices may vary due to silver market and may vary due to change in poison packaging charges. Phone for quotations.
|100 gram: Call for $ 500 gram: Call|
Sodium carbonate - for standardizing acid solution
|100 gram: $12.50 500 gram: $48.30|
Sodium chloride - for standardizing silver nitrate solution
|100 gram: $11.85 500 gram: $45.75|
Sodium oxalate - for standardizing permanganate solution
|100 gram: $14.80 500 gram: $58.25|
* Shipped in Poison Packs at extra charge