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A factory produces chlorine, caustic soda, hydrogen and other chemical products by electrolysis of saturated salt solution (the chemical equation of the reaction is 2NaCl+2H 2 O 2NaOH).

ⅰ. 2 NaOH+CO2 = = na2co 3+H2O； When sodium hydroxide is precipitated from the electrolyte, a small amount of unreacted sodium chloride is simultaneously precipitated;

Incorrect;

Ii. solution: let the mass of Na 2 CO 3 in 20g sample be x, and the mass of x and NaCl be y. ..

Na 2 CO 3 +2HCl==2NaCl+H 2 O+CO 2 ↑？ NaCl+AgNO 3 ==AgCl↓+NaNO 3？

10644 58.5? 143.5

x 0.22g y？ 2.87 grams

?

x=0.53g？ ，y= 1. 17g？

Mass fraction of sodium hydroxide =? × 100%=9 1.5%

A: The mass fraction of sodium hydroxide in the caustic soda sample is 9 1.5%? ;

wash

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