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mNa2CO3*xH₂O=106+18x [u]
mNa=23u
106+18x [g] ----- 100%
46 [g] ------------- 16,08%
(106+18x)*16,08 = 46*100
1704,48+289,44x = 4600
289,44x = 2895,52
x = 10
Wzór hydratu: Na2CO3*10H₂O
b)
mNa₂SO₄*xH₂O=142+18x [u]
mNa₂SO₄=142u
142+18x [g] ----- 100%
142 [g] ------------- 49,99%
(142+18x)*49,99 = 142*100
7098.58+899,82x = 14200
899,82x = 7101,42
x = 8
Wzór hydratu: Na₂SO₄*8H₂O