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.
Plumbing Fixture Permit A plumbing permit is required when any fixture is relocated, or for the replacement of bathtub with shower or a whirlpool tub or shower pan. Residential Permit Construction of new home. A building permit is required for any addition to a one, two, or three family dwelling unit. Roof Replacement Permit. A permit is required for the replacement of an existing roof. Sewer Replacement Permit A plumbing permit is required for the replacement of an existing sewer.