If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
223336
Sodium tungstate dihydrate
ACS reagent, ≥99%
Synonym(s):
Tungstic acid sodium salt dihydrate
Select a Size
| Size/SKU | Availability | Price |
|---|---|---|
5 g | Available to ship TODAYfromMILWAUKEE | $46.75 |
100 g | Available to ship TODAYfromMILWAUKEE | $153.00 |
500 g | Available to ship TODAYfromMILWAUKEE | $474.00 |
About This Item
$46.75
List Price$55.00Save 15%Available to ship TODAYDetails
grade
ACS reagent
Quality Segment
assay
≥99%
form
crystalline powder
reaction suitability
reagent type: catalyst
core: tungsten
impurities
≤0.01% insolubles, ≤0.02 meq/g Titr. free base
pH
9-11.5 (20 °C, 100 g/L)
mp
698 °C (lit.)
anion traces
chloride (Cl-): ≤0.005%, sulfate (SO42-): ≤0.01%
cation traces
Mo: ≤0.001%, heavy metals and iron (as Pb): ≤0.001%
SMILES string
O.O.[Na+].[Na+].[O-][W]([O-])(=O)=O
InChI
1S/2Na.2H2O.4O.W/h;;2*1H2;;;;;/q2*+1;;;;;2*-1;
InChI key
WPZFLQRLSGVIAA-UHFFFAOYSA-N
General description
Application
1 of 1
This Item | |||
|---|---|---|---|
| form crystalline powder | form crystals | form crystals | form crystals |
| assay ≥99% | assay 99.0-100.5 | assay ≥99.0% (T) | assay ≥99.0% (T) |
| grade ACS reagent | grade JIS special grade | grade reagent grade | grade reagent grade |
| impurities ≤0.01% insolubles, ≤0.02 meq/g Titr. free base | impurities - | impurities insoluble matter, passes filter test, ≤0.001% total nitrogen (N), ≤0.1% free alkali (as NaOH) | impurities insoluble matter, passes filter test, ≤0.001% total nitrogen (N), ≤0.1% free alkali (as NaOH) |
| anion traces chloride (Cl-): ≤0.005%, sulfate (SO42-): ≤0.01% | anion traces - | anion traces chloride (Cl-): ≤50 mg/kg, sulfate (SO42-): ≤100 mg/kg | anion traces chloride (Cl-): ≤50 mg/kg, sulfate (SO42-): ≤100 mg/kg |
| pH 9-11.5 (20 °C, 100 g/L) | pH 9.0-11.5 (20 °C, 100 g/L) | pH 9.5-11.5 (25 °C, 1 M in H2O) | pH 9.5-11.5 (25 °C, 1 M in H2O) |
Still not finding the right product?
Explore all of our products under Sodium tungstate dihydrate
signalword
Warning
hcodes
Hazard Classifications
Acute Tox. 4 Oral
Storage Class
13 - Non Combustible Solids
flash_point_f
Not applicable
flash_point_c
Not applicable
Choose from one of the most recent versions:
Already Own This Product?
Find documentation for the products that you have recently purchased in the Document Library.
-
How can I determine the shelf life / expiration / retest date of this product?
1 answer-
Helpful?
-
-
How is shipping temperature determined? And how is it related to the product storage temperature?
1 answer-
Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
Helpful?
-