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# ICSE Class 9 Answered

find the weight of sodium nitrate required to prepare 60g pure crystals from its saturated solution at 70c.solubility of sodium nitrate is 140g at 70c and 100 at 25c.("c"stands for celsius of temperature
Asked by dishaprep | 01 Sep, 2018, 11:03: PM
Expert Answer
Given:

Solubility at 70°C = 140
Solubility at 70°C = 100

Amount of crystals obtained when the solution is cooled from 70°C to 25°C
= 140-100 = 40 g

To obtain 40 g of crystals sodium nitrate is taken is 140 g.

To obtain 60 g crystals, sodium nitrate required will be =
Answered by Ramandeep | 03 Sep, 2018, 12:30: PM

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