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(1) Generally, zeolite is often added when heating the mixed solution to prevent the solution from boiling when heating, so the answer is: zeolite; Prevent boiling;

(2) Potassium permanganate has a strong oxidizing property and Na2SO3 solution has a strong reducing property, and they have a redox reaction. The valence of permanganate is reduced to manganese dioxide 3, and the valence of sulfite is increased by 2, so according to the conservation of gain and loss electrons, permanganate× 2 and sulfite× 3, so the ionic equation is: 2mno4-+3so32-+H2O = 2mno2.

So the answer is: 2mno4-+3so32-+H2O = 2mno2+3so42-+2oh-;

(3) Because the solubility of benzoic acid is relatively small at low temperature, it is necessary to filter it while it is hot in order to obtain a high concentration benzoic acid solution, so the answer is: at low temperature, the solubility of benzoic acid is small, which will reduce the yield of benzoic acid;

(4) due to the large cooling contact area in the cold water bath, the cooling is sufficient; Acidification of concentrated hydrochloric acid mainly involves the reaction of potassium benzoate to benzoic acid.

So the answer is: in a cold water bath; ;

(5) According to conservation, the theoretical yield of benzoic acid is 2.392× 122=3.05g, and the yield of benzoic acid =m (actual yield) m (theoretical yield) ×100% =1.833.05×/kloc-.