Which of the following common household substances can conduct electricity is ( ) A. Sucrose water B

A. Since there are no freely moving ions in sucrose water and it cannot conduct electricity, A is false < /p> B There are freely moving ions in salt water; and can conduct electricity. Therefore, B is correct; C. Since edible alkaline powder does not contain free-moving ions, it cannot conduct electricity. Therefore, C is false; D. Since there are no free ions in medical alcohol, it cannot conduct electricity, so D is false. Then choose B.

(1) Electrolysis of saturated salt water to generate hydrogen, chlorine (Cl2 ) and caustic soda: 2NaCl+2H2O

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2NaOH+Cl2↑+H2 ↑ , the ionic equation is: 2Cl-+2H2O

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2OH-+Cl2↑+H2↑, so the answer is: 2NaCl+2H2O

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2NaOH+Cl2↑+H2↑ 2Cl-+2H2O

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2OH-+Cl2↑+H2↑; < /td> p>

(2) Reaction 2NaCl+2H2O

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In 2NaOH+Cl2↑+H2↑, the element Cl with increased valence is oxidized and the element H with increased valence diminished is reduced, so the answerThe case is: Cl; H;

(3) ① During the purification of crude salt, magnesium ions are precipitated with caustic soda, and sodium carbonate can remove barium ions and sulfate ions are precipitated with barium chloride and excess added barium chloride can also prec;ipitate excess carbonate ions, so the answer is: CO32-; Ba2+, Mg2+;

② Hydrochloric acid is added at the end to neutralize the solution to neutrality; , that is, H++OH-=H2O, so the answer is: H++OH-=H2O.