Formic acid contains 53 g L â1 hydrogen at room temperature and atmospheric pressure. By weight, pure formic acid stores 4.3 wt% hydrogen. Pure formic acid is a liquid with a flash point 69 Â°C (cf. gasoline â40 Â°C, ethanol 13 Â°C). 85% formic acid is not flammable.
Tombstone is located in Cochise County of southeast Arizona, 70 miles southeast of Tucson, 20 miles east of the San Pedro River and 15 miles southwest of the Dragoon Mountains.
In 1862, the California Column drove the Confederate forces out of Arizona. Tucson and all of what is now Arizona were part of New Mexico Territory until 1863, when they became part of the new Arizona Territory. From 1867 to 1877, Tucson was the capital of the Arizona Territory. Tucson was incorporated in 1877, making it the oldest incorporated city in Arizona.