Can Someone please help me

Question

Which of the following is NOT a hydrate?

a. NiSO4 . 6H2O

b. MgSO4 . 7 H2O

c. NaCl

d. Na2CO3 . H2O

Answer 1

A hydrate is when a compound combines with a water molecule signified by a period after the compound and then a coefficient signifying the number of water molecules the compound is bound to.

a) NiSO4.6H20 is a hydrate named nickel sulfate hexahydrate (6 water molecules combined)

b) MgSO4.7H20 is a hydrate named magnesium sulfate heptahydrate (7 water molecules combined)

c) NaCl is not a Hydrate as there are no water molecules combined with the compound.

d) Na2CO3.H2O is a Hydrate named sodium carbonate monohydrate (1 water molecule combined)