2g of a mixture hydroxide and sodium chloride as impurity
were dissolved in 500 cm3 of water. If 25cm3 of this solution
were neutratred by 21 cm² of 0.1mol dm3 of hydrochloric acid,
calculate the percentage of the sodium chloride impurity.
(NaoH=40,Hcl=36.5,NACl=58.5)
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