Question

How many hydrogen-bonded water molecule(s) are associated in $CuS{O}_4.5H_{2}O?$

Answer 1

From aqueous solutions many salts can be crystallised as hydrated salts. E.g., ${\left[Cu\right(H_{2}O{)}_4]}^{2+}S{O}_4^{2-}.H_{2}O$ in $CuS{O}_4.5H_{2}O$ Only one water molecule, which is outside the brackets (coordination sphere), is hydrogen-bonded. The other four molecules of water are coordinated..