A student wants to represent an aqueous solution of Na₂S at the particulate level. Which description is most consistent with the correct stoichiometry and orientation of water molecules around the ions?
a) Twice as many S2− ions as Na+ ions, with water molecules oriented with hydrogen atoms toward S2− ions and oxygen atoms toward Na+ ions.
b) Twice as many Na+ ions as S2− ions, with water molecules oriented so that the hydrogen atoms point toward the S2− ions and the oxygen atoms point toward the Na+ ions.
c) Twice as many Na+ ions as S2− ions, with water molecules oriented with oxygen atoms toward both ions.
d) Twice as many Na+ ions as S2− ions, with water molecules oriented with oxygen atoms toward S2− ions and hydrogen atoms toward Na+ ions.