Question

Narceine is a narcotic in opium that crystallizes from solution as a hydrate that contains 10.8 mass % water and has a molar mass of 499.52 g/mol. Determine x in narceine . xH₂O.

Answer 1

Thewater of hydration x in narceine. xH₂O is 3

What is Water of Hydration?

• In chemistry, water molecules found inside crystals are referred to as "water of crystallization" or "water of hydration." When crystals are formed from aqueous solutions, water is frequently included.
• The entire mass of water in a substance at a specific temperature is sometimes referred to as water of hydration, and it is typically present in a stoichiometric ratio.
• The term "water of crystallization" has historically been used to describe water that is not physically linked to the metal cation but is present in the crystalline structure of a metal complex or salt.
• Many chemicals include water molecules in their crystalline structures when they crystallize from water or solvents that contain water. Heating a sample usually removes the water of crystallization, but the crystalline qualities are frequently lost.

Given that hydrate is 10.8% by mass

molar mass = 499.52 g/mol

calculating the amount of water

mass of water = $\dfrac{10.8 \times 499.5}{100}$

mass of water = 53.95 g

moles of water = $\dfrac{mass}{molar mass}$

moles of water = $\dfrac{53.95}{18}$ = 3

then the water of hydration x in narceine. xH₂O is 3

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