D - Hydrates

Question 1

water of hydration

Answer 1

water is incorporated as an essential part of the crystal structure of the compound

it’s not just absorbed on the surface of the compound

Question 2

how to remove water absorbed on the surface of a compound

Answer 2

gentle heating

Question 3

water of crystallization

Answer 3

same thing as water of hydration

Question 4

T/F The water of crystallization is bound directly to the ion

Answer 4

false

Question 5

for the molar mass of a hydrate, do you include the molar mass of water

Answer 5

yes

Question 6

efflorescence

Answer 6

spontaneously lose water to the atmosphere

Question 7

cause of efflorescence

Answer 7

vapour pressure of water exerted by the hydrate is greater than the vapour pressure of the water in the atmosphere

Question 8

desiccants

Answer 8

compounds that spontaneously absorb water from the atmosphere

Question 9

hygroscopic

Answer 9

same thing as desiccant

Question 10

cause of desiccant

Answer 10

vapour pressure of water exerted by the solid is less than the vapour pressure of water in the atmosphere

Question 11

deliquescent

Answer 11

compounds that absorb so much water from the atmosphere that they dissolve in their own water of hydration

Question 12

how to remove the water of crystallization from a hydrate

Answer 12

heated to a temperature at which the vapour pressure of water of the hydrate becomes greater then the pressure of water in the atmosphere

Question 13

anhydrous form

Answer 13

when all of the water is gone from the compound

Question 14

indication that the water of hydration has been driven off

Answer 14

1) colour change
2) form of the Crystal changes
3) it dissolves is in its own water of crystallization, which evaporates and leaves the anhydrous solid behind

Question 15

how to calculate the mass of water in the sample

Answer 15

original mass of sample - mass of sample after heating

Question 16

how to calculate the mass percent of water

Answer 16

mass of water in the sample/original mass of sample

Question 17

how to calculate the moles of the anhydrite in the sample?

Answer 17

mass of the sample after heating/molar mass of the anhydrite

Question 18

how to get moles of water in the sample

Answer 18

mass of water in the sample/molar mass of water

Question 19

how to get empirical form of hydrate

Answer 19

ratio of moles of anhydrate to moles of water

Question 20

what is a cation that emits a green flame

Answer 20

Cu 2+

Question 21

what is a cat ion that emits a yellow flame

Answer 21

Na+

Question 22

what is a cat ion that emits a Violet flame

Answer 22

K+

Question 23

what is a cat ion that emits a green flame and has white precipitate

Answer 23

Ba 2+

Question 24

what happens when water was added back to the copper sulphate Crystal?

Answer 24

it regenerated

Question 25

how many hydroxide groups are in vitamin C

Answer 25

4

Question 26

T/F each Iodate added forms 4 I2

Answer 26

false

it forms 3 I2