# Chemistry Intro

If the solubility of alum is 1g @ 1 degree celcius and 1.7 g at 6 degree celcius how much alum (KAl(SO4)2.12H20) would you expect to dissolve at 5.5% C?

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1. Without any other information this maybe a simple linear relationship, especially over the small temperature range.

1 g at 1C
1.7 g at 6C

so solubility is given by

1 g + 0.7g/5 (T-1)

so if T=5.5C

solubility is
1 g + 0.7g/5 (5.5-1)
=1 g + 0.63 g = 1.63 g

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posted by Dr Russ

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