Tawas City, Michigan

Tawas City is a city along Lake Huron in the Lower Peninsula of the U.S. state of Michigan. The population was 1,827 at the 2010 census. It is the county seat of Iosco County. The city is adjacent to Tawas Township but is administratively autonomous.

History

Tawas City was founded in 1854 as the first city to be located on the shores of Saginaw Bay and Lake Huron north of Bay City. Tawas City was established as the county seat of Iosco County, and the first post office was established Jan. 6, 1856, with James O. Whittemore appointed postmaster.

Since Tawas City’s founding, the community’s economy has been a major factor influencing land use and development patterns in the city. The rich natural resource base of the area (forest lands, Lake Huron and wildlife) combined with the protection offered by Tawas Bay provided the basis for the original founding of the city and caused the lumber industry to flourish. Tawas Bay continues to serve as a harbor of refuge that large freighters use to escape the adverse effects of storms on Lake Huron. The shoreline, as the transition zone between land and water, became the focus of the community, with the city developing in a linear fashion along the bayshore.

Potassium alum

Potassium alum, potash alum, or potassium aluminum sulfate is a chemical compound: the potassium double sulfate of aluminium. Its chemical formula is KAl(SO₄)₂ and it is commonly found in its dodecahydrate form as KAl(SO₄)₂·12H₂O. Alum is the common name for this chemical compound, given the nomenclature of potassium aluminum sulfate dodecahydrate. It is commonly used in water purification, leather tanning, dyeing, fireproof textiles, and baking powder. It also has cosmetic uses as a deodorant, as an aftershave treatment and as a styptic for minor bleeding from shaving.

Characteristics

Potassium alum crystallizes in regular octahedra with flattened corners, and is very soluble in water. The solution reddens litmus and is an astringent. When heated to nearly a red heat it gives a porous, friable mass which is known as "burnt alum." It fuses at 92 °C (198 °F) in its own water of crystallization. "Neutral alum" is obtained by the addition of as much sodium carbonate to a solution of alum as will begin to cause the separation of alumina.