Dry Qualitative Unknowns

A Reminder:

All qualitative analysis knowns and unknowns are for laboratory use only and to be used under the supervision of a trained laboratory instructor.

Custom unknowns are now available on a limited basis.

  • Cobalt and nickel may be added to the listed unknowns
  • Unknowns may be prepared with lead and mercury
  • Allow 4-6 weeks preparation and delivery time for custom unknowns

2 Mil colored ziplock bags are now used in stocking dry qual unknowns. We no longer employ plastic vials or cellophane bags. We suggest you cut diagonally across the lower corner, away from the ziplock, to empty unknowns from the bags.

INSTRUCTOR TIME SAVER

Prepared individual samples eliminate the need to label and fill racks of test tubes for each analysis group. The removable adhesive code number may be placed in the grade book indicating the unknown assignment. By referring to the key, you may be confident of the ion each student should report.

EDUCATIONAL AND EASY TO USE

Students have the opportunity to dissolve a solid and consider the fact that both cations and anions are present. The unknown solid needs just a few seconds to dissolve and the sample is ready for analysis.

RELIABLE

The raw materials are reagent grade. No inert fillers are added and no trace elements are present except those listed by the manufacturer. The sample size is between 0.37 & 0.40 g with approximate equal amounts by weight of each raw material. The exception is Ag + which is high purity and 0.25 & 0.30 g. The unknowns have a stable shelf life.

REDUCE STORAGE SPACE

Storage space needed for raw material bottles and the various known and unknown solutions may easily use several shelves in the storeroom. The ziplock packets require little storage space.

MANY COMBINATIONS

For each analysis group, there are several possible ion combinations. The packet is colored blue to provide an uniform appearance and to disguise the various metal ion colors.

CONTROL COSTS

A fixed amount of material is provided to each student at a known cost. Students may be charged if an extra packet is required. Purchase only the number of unknowns needed.

OTHER USES

Anions and cations may be studied by infrared spectroscopy, paper chromatography, ion exchange chromatography, and emission spectroscopy.

Group I

Catalog # Material (MSDS info)   Price

82-1100

Ag

  $1.90

Pb

  $1.90

Hg22+

  $1.90

Ag Pb

  $1.90

Pb Hg22+

  $1.90

Ag Hg22+

  $1.90

Ag Pb Hg22+

  $1.90

Group II

Catalog # Material (MSDS info)   Price

82-1110

Pb Cu Sn

  $1.80

Hg2+ Cu

  $1.80

Pb Bi Sb

  $1.80

Cu Sb Sn

  $1.80

Hg2+ Pb Bi Sb Sn

  $1.80

Hg2+ Pb Bi Cu Sn

  $1.80

Hg2+ Bi Cu Sb

  $1.80

Pb Cu Sb

  $1.80

Hg2+ Pb Cu Sb

  $1.80

Pb Bi Cu

  $1.80

Hg2+ Bi Cu Sn

  $1.80

Group III

Catalog # Material (MSDS info)   Price

82-1120

Al Fe Zn

  $1.80

Cr Fe Mn

  $1.80

Al Mn Zn

  $1.80

Cr Mn Zn

  $1.80

Al Fe Mn

  $1.80

Cr Fe Zn

  $1.80

Al Fe Mn Zn

  $1.80

Cr Fe Mn Zn

  $1.80

Fe Mn

  $1.80

Al Cr Fe Mn Zn

  $1.80

Fe Zn

  $1.80

Mn Zn

  $1.80

Group IV

Catalog # Material (MSDS info)   Price

82-1130

Ba

  $1.80

Ca

  $1.80

Sr

  $1.80

Ba Ca

  $1.80

Ba Sr

  $1.80

Ca Sr

  $1.80

Ba Ca Sr

  $1.80

Group V

Catalog # Material (MSDS info)   Price

82-1140

NH4

  $1.80

Mg

  $1.80

K

  $1.80

Na

  $1.80

NH4 Mg

  $1.80

Mg K

  $1.80

NH4 Na

  $1.80

NH4 Mg K

  $1.80

NH4 Mg Na

  $1.80

Anions

Catalog # Material (MSDS info)   Price

82-1300

SO42-

  $1.80

Cl-

  $1.80

S2-

  $1.80

Br-

  $1.80

PO43-

  $1.80

I-

  $1.80

CO32-

  $1.80

NO3-

  $1.80

SO32- SO42-

  $1.80

C2H3O2-

  $1.80

NO3- SO42-

  $1.80

PO43- Cl-

  $1.80

S2- Br-

  $1.80

I- C2H3O2-

  $1.80

CO32- Cl-

  $1.80

PO43- SO42-

  $1.80

SO42- Br-

  $1.80

C2H3O2- PO43-

  $1.80

Cl- SO42- CO32-

  $1.80

SO32- SO42- NO3-

  $1.80

General Unknowns

Basic charge for all custom unknowns is $2.25 each.

Catalog # Material (MSDS info)   Price

82-1200

Ag Cu Bi Cr Fe Mn Ba Mg K

  $1.80

Hg22+ Hg2+ Sb Al Zn Ca Mg Na

  $1.80

Pb Cu Sn Cr Fe Mn Sr Mg

  $1.80

Hg22+ Hg2+ Cu Cr Mn Ba NH4

  $1.80

Pb Bi Al Mn Zn Sr Mg K

  $1.80

Ag Hg2+ Sb Cr Mn Zn Ca NH4

  $1.80

Pb Bi Cr Fe Ba Mg K

  $1.80

Bi Hg2+ Cr Mn Zn Sr Mg NH4

  $1.80

Pb Cu Sb Sn Al Fe Zn Ca Mg K

  $1.80

Ag Hg2+ Sb Cr Mn Ba Sr NH4

  $1.80

Bi Hg2+ Sn Fe Mn Ca Mg Na

  $1.80

Pb Cu Hg2+ Sb Cr Mn Zn Sr Mg K

  $1.80

Pb Sb Al Zn Ba Ca Na

  $1.80

Cu Hg2+ Al Fe Ca K

  $1.80

Ag Pb Bi Sn Al Cr Sr NH4

  $1.80

Hg22+ Cu Hg2+ Sb Fe Mn Zn Mg

  $1.80

Hg22+ Pb Bi Hg2+ Al Mn Ca Sr

  $1.80

Cu Bi Hg2+ Sb Sn Cr Fe Zn Ba Sr Mg

  $1.80

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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All Rights Reserved.
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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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