Sodium fluoride.
deferentirt the classification of elements
Sodium with HCl gives NaCl and H2 2Na + 2HCl -> 2NaCl + H2
water,carbon-dioxide,glucose,sodium chloride,iron sulphide,lead chloride,sulphur dioxide
Sodium is easily oxidised, contact with the air will form a thin layer of Sodium Oxide over its surface, which would be considered an impurity.
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Hydrogen, oxygen, calcium or sodium
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sodium hydroxide, calcium carbonate, sodium fluoride, sodium chloride, carbon dioxide......
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Sodium fluoride.
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