Crushed sago soaked overnight test with caustic soda and copper sulphate
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NaOH is a strong base while CuSO4 is an acidic salt. When their solutions are mixed with each other, a pale blue precipitate of basic copper hydroxide & a solution of neutral salt sodium sulphate will be formed. 2NaOH + CuSO4 --> Cu(OH)2 + Na2SO4. This is a double displacement as well as precipitation reaction.
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