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Resorcinol, excess formaldehyde, and sodium sulphate were dissolved in water and heated with stirring on a water bath. As soon as the solution became cloudy, the reaction was terminated by the addition of a large volume of cold water. The precipitate was filtered off, washed with water, and dried at room temperature.

1. temperatureheated
2. customthe reaction was terminated by the addition of a large volume of cold water
3. filtrationThe precipitate was filtered off
4. washwashed with water
5. customdried at room temperature