A variety of hydrates of this salt are known, ranging from the decahydrate below 19.5 °C (CAS# 13517-17-4 ) as well as hexa-, tetra-, and dihydrates.
Berbagai garam hidratnya telah diidentifikasi, mulai dari dekahidrat di bawah 19,5 °C (CAS# 13517-17-4 ) heksa-, tetra-, and dihidrat.