Check the listing for details. Potassium Carbonate, Reagent , 99% min., 500 grams. Condition: New – Open box. Listed at 17.95 USD. Here is 500 grams of Reagent Potassium Carbonate. Anyone claiming 100% pure material is full of baloney!! This material was originally anhydrous , but may have absorbed a small amount of water upon storage. Buyer must be 21 years of age. Buyer assumes all liability for the use of this item. Buyer agrees to use this item in accordance with all local, state, and federal laws. This is for laboratory and scientific use only! Shipping will comply with all USPS regulations. Item is NOT regulated by the DOT. NOTE TO EBAY: PLEASE DO NOT DE-LIST!!! This chemical is legal to ship by the USPS in Publication 52 and is not restricted for shipping.Here is 500 grams of Reagent Potassium Carbonate. Anyone claiming 100% pure material is full of baloney!! This material was originally anhydrous , but may have absorbed a small amount of water upon storage. Buyer must be 21 years of age. Buyer assumes all liability for the use of this item. Buyer agrees to use this item in accordance with all local, state, and federal laws. This is for laboratory and scientific use only! Shipping will comply with all USPS regulations. Item is NOT regulated by the DOT. NOTE TO EBAY: PLEASE DO NOT DE-LIST!!! This chemical is legal to ship by the USPS in Publication 52 and is not restricted for shipping.