Analyzed Quantitative Unknowns

Quantitative Unknowns

A wide variety of readily available Thorn Smith Quantitative Unknowns include:

Gravimetric unknowns such as Soluble Chloride, Soluble Sulfate, Ferrous Ammonium Sulfate

Oxidimetric unknowns such as Soluble Oxalate, Arsenious Acid, and Ferrous Ammonium Sulfate

Acidimetric unknowns such as Acid Potassium Phthalate and Soda Ash

Complexometric unknowns such as Copper Oxide (particularly recommended), Calcium Carbonate and Magnesium Sulfate

Other unknowns such as Brass, Steel, Silver Alloys and numerous others.

Varieties of Student Quantitative Unknowns (Series)

What Is A Series?

Most batches of active materials are divided into as many as 25 lots. These lots are then carefully measured and portioned with the differing percents of inactive ingredients. This procedure is what is referred to as a series of student unknowns. For example, iron oxide is produced in a series of 25 unknowns with each lot carefully prepared, analyzed, recorded and then inventoried.

Filling Orders For Series

It is our policy to send one of each series when filling your order. If you order 18 student unknowns of iron oxide, you should receive 18 varieties depending on availability and balancing of our inventories. At certain times we may even have more (sometimes we may have more; sometimes less) than the 25 listed varieties, due to residual inventories from previous series after a new series is produced. In these cases, if you should order 33 iron oxide student unknowns, it is conceivable that you will receive 33 varieties without duplicates. This kind of service to you is automatic without your need of requesting it. In any case, please call to verify quantities.

Lot Specifications

Our standard practice is to provide a variety of percentages when filling unknown orders. When the requester places an order, we automatically send a variety of lots. We do not duplicate lots unless it is specifically requested by the buyer, or availability is such that we cannot give all separate lots.

When the requester asks for specific lots it depletes our inventory unevenly. We can accomodate requested lots only if they are available. There is a Lot Specification Charge added to each order for each lot being requested. This charge is $2.00 per lot specified.

Catalog # Material (MSDS info) Approx. Lots Available   Price

80-1010

Aluminum-magnesium alloy for Al, Mg (also known as Dow Metal)

4   Student Vial: $3.70       100 gram: $26.90

80-1020

Aluminum-zinc alloy for Al, Zn

3   Student Vial: $3.70       100 gram: $26.90

80-1045

Antimony ore for Sb

25   Student Vial: $2.80       100 gram: $20.65

80-1055

Arsenic
Highly toxic; shipped in Poison Packs*

20   Student Vial: $2.50       100 gram: $18.20

80-1070

Brass "A" for Sn, Pb, Cu, Zn

11   Student Vial: $3.80       100 gram: $27.80

80-1080

Brass "B" for Sn, Cu, Zn

1   Student Vial: $3.50       100 gram: $25.60

80-1085

Brass "C" for Cu, Pb, Zn

1   Student Vial: $3.50       100 gram: $25.60

80-1090

Brass "D" for Cu, Zn

1   Student Vial: $3.50       100 gram: $25.60

80-1115

Calcium carbonate for CaO

25   Student Vial: $3.70       100 gram: $26.90

80-1135

Cast iron for P, Mn, S, Si, C (total and graphitic)

6   Student Vial: $3.55       100 gram: $25.60

80-1150

Cement for SiO2, Fe2O3, Al2O3, CaO, MgO, SO3, loss on ignition

6   Student Vial: $3.55       100 gram: $25.60

80-1175

Chromium ore for Cr

24   Student Vial: $3.35       100 gram: $24.75

80-1200

Copper ore for Cu

10   Student Vial: $2.70       100 gram: $19.90

80-1230

Copper oxide (easily soluble in acid) for Cu

25   Student Vial: $2.85       100 gram: $23.05

80-1260

Ferrous ammonium sulfate for Fe

25   Student Vial: $5.15       100 gram: $34.10

80-1275

Iron ore (natural) for Fe

11   Student Vial: $3.25       100 gram: $23.30

80-1300

Iron oxide for Fe (easily soluble in acid)

20   Student Vial: $3.25       100 gram: $24.75

80-1320

Limestone for CaO, MgO, SiO2, R2O3

15   Student Vial: $3.55       100 gram: $25.60

80-1355

Magnesium sulfate for MgO

10   Student Vial: $2.55       100 gram: $19.45

80-1370

Manganese ore for Mn and O

22   Student Vial: $2.65       100 gram: $19.45

80-1375

Monel metal for Si, Cu, Ni

1   Student Vial: $4.20       100 gram: $30.75

80-1385

Nickel silver for Cu, Ni, Zn (also known as German Silver)

6   Student Vial: $4.20       100 gram: $30.75

80-1395

Nickel oxide for Ni

10   Student Vial: $3.65       100 gram: $26.95

80-1425

Phosphate rock for P2O5

20   Student Vial: $2.80       100 gram: $20.65

80-1475

Potassium biphthalate for acidity

25   Student Vial: $5.15       100 gram: $34.10

80-1485

Silver alloy "E" for Ag, Cu, Zn and Ni

1   Student Vial: $11.10       100 gram: N/A

80-1487

Silver alloy GL for Ag only (10 to 30% Ag)

3   Student Vial: $5.70       100 gram: N/A

80-1488

Silver alloy GM for Ag only (50 to 60% Ag)

2   Student Vial: $8.25       100 gram: N/A

80-1489

Silver alloy GH for Ag only (85 to 95% Ag)

1   Student Vial: $11.95       100 gram: N/A

80-1510

Soda ash for Na2CO3

25   Student Vial: $4.00       100 gram: $29.00

80-1545

Soluble antimony (Tartar Emetic) for Sb

15   Student Vial: $2.55       100 gram: $19.45

80-1575

Soluble chloride for Cl

25   Student Vial: $3.40       100 gram: $26.00

80-1600

Soluble oxalate for Na2C2O4

25   Student Vial: $3.35       100 gram: $23.75

80-1650

Soluble phosphate for P2O5

20   Student Vial: $3.35       100 gram: $24.45

80-1675

Soluble sulfate for SO3

17   Student Vial: $3.90       100 gram: $27.15

80-1680

Steel "A" for C, Mn, P, S, Si

4   Student Vial: $3.55       100 gram: $25.00

80-1685

Steel "G" Stainless for Ni, Cr, Si

2   Student Vial: $4.00       100 gram: $28.15

80-1700

Steel "H" for C, Mn, P, S, Si, Ni, Mo

4   Student Vial: $4.05       100 gram: $29.00

80-1715

Zinc ore for Zn

10   Student Vial: $3.15       100 gram: $22.70

* Shipped in Poison Packs at extra charge

How to Order

Download our Catalog (in PDF format).

Download our order form, fill it out online and either fax it us at 231-882-4804 or email it to us at This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

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Thorn Smith Laboratories
7755 Narrow Gauge Road, Beulah, MI 49617
Phone: 231-882-4672 - 231-882-7251
Fax: 231-882-4804
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