1.Previous
3.Next

The only alums formed with common trivalent metals are NaAl(SO₄)₂ (unstable above 39 °C) and NaCr(SO₄)₂, in contrast to potassium sulfate and ammonium sulfate which form many stable alums. Double salts with some other alkali metal sulfates are known, including Na₂SO₄·3K₂SO₄ which occurs naturally as

1.Previous
3.Next