[Crystallization] One tonne of a 30 % solution of soda ash, Na₂CO3 in water is cooled slowly to 20°C. During cooling, 10% of the water originally present is evaporated precipitating out sal soda, Na2CO3.10H₂O. If the solubility of soda ash at 20°C is 21.5 parts/100 parts water, what weight of sal stolling

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