Hydrates

Question 1

What are salts?

Answer 1

○ an ionic compound

○ 2 or more metals and non-metals bonded together

Question 2

What is an Anhydrate?

Answer 2

○ A salt molecule that is not bound to any water molecules

Question 3

What are hydrates? (2 definitions name both)

Answer 3

○ a substance associated with a fixed number of intact water molecules

○ Alternative definition: an ionic compound bonded to water molecules in a definite proportion

Question 4

How are salts hydrated ?

Answer 4

○ Salts spontaneously incorporate
water molecules into their solid form

(spontaneously meaning this happens without any external input of energy)

Question 5

Adding more and more solute to a solvent…

Answer 5

○ Makes a solution more and more concentrated

○ Eventually, the solution will become more saturated

Question 6

1. A sample of hydrated magnesium sulfate has a mass
   of 5.742g. when heated, steam is visibly produced.
   Once steam no longer appeared, the sample of
   magnesium sulfate was weighed again, with a mass of
   2.801g. Determine the chemical formula of the
   hydrate (5mark).

Answer 6

MgSO4 . 7H2O

Question 7

Determine a formula and name for a hydrate that is 14 % water and 85.2 % barium chloride.

Answer 7

BaCl2 . 2H2O

Question 8

Do the question which is sample 3 on the hydrates slide (only part c) (hint: MOLES matters in this case because of comparison)

Answer 8

c) 52 kg

Question 9

What does saturated mean

Answer 9

when a solution is unable to absorb or dissolve any more of a solute at a given temperature and pressure