Answer:
Water has one potential H-bond acceptor site, and two potential H-bond donor sites
Step-by-step explanation:
H-bond is formed between an electronegative atom (O, N and F) and a H atom attached directly with an electronegative atom (O, N and F).
Molecule whose lone pair on electronegative atom is used to make H-bond with a H atom of another molecule is called H-bond acceptor and the other H atom donating molecule is called H-bond donor.
Water can donate only one lone pair on oxygen atom to make H-bond. Hence it has one potential H-bond acceptor site.
Water can donate both two H atoms to form H-bond with other molecules. Hence it has two potential H-bond donor sites