Possible impurities. The systematic name of aspirin is 2-ethanoylhydroxybenzoic acid. We usually make it by the esterification of 2-hydroxybenzoic acid (salicylic acid) using ethanoic anhydride and a catalyst such as concentrated sulphuric acid or phosphoric acid.
TxDMV Â» Motor Carriers Â» Oversize / Overweight Permits. Vehicles and loads that exceed legal size or weight limits need an oversize/overweight (OS/OW) permit and route from the TxDMV to travel on Texas roads.
Exception to this is the dayhike up Half Dome, which is controlled by a quota to keep it from getting too overcrowded and thus requires a permit. Backpacking is defined in the USA as sleeping out overnight (or many nights) in the wilderness and carrying with you all the gear and food you will need, for that you need a permit in Yosemite.