Illustrated Guide to Home Chemistry Experiments

118 DIY Science: Illustrated Guide to Home Chemistry Experiments

RQEWEvI UESTIOnS

q 1 : How does anhydrous copper sulfate differ in appearance from hydrated copper sulfate?

q: 2 The formula weight of hydrated copper sulfate is 249.7 grams per mole (g/mol). How many moles of hydrated copper sulfate
were present in your sample (line C of Table 6-7)?

Item Data

A. Mass of crucible and cover _______.____ g

B. Initial mass (crucible, cover, and

hydrate salt) _______.____ g

C. Mass of hydrate salt (B – A) _______.____ g

D. Final mass (crucible, cover, and

anhydrous salt)

_______.____ g

E. Mass of anhydrous salt (D – A) _______.____ g

F. Mass loss (C – E) _______.____ g

oALIpToN ACTIvITIES

If you have time and the required materials, consider

performing these optional activities:

• Repeat the experiment, substituting magnesium
  sulfate heptahydrate (Epsom salts) for the copper
  sulfate pentahydrate.


• Repeat the experiment, substituting hydrated sodium
  carbonate (washing soda) for the copper sulfate
  pentahydrate.

TABLE 6-7: Formula of a hydrate—observed and calculated data