MH (N2 H4) is a compound formed by nitrogen and hydrogen, which is easy to dissolve in water. it is produced by urea method in industry, and the by-product ten hydrated sodium carbonate is obtained, (1) the preparation solution needs to be carried out in the beaker,Need to use the volume of water,Stir with a glass stick,Also use the glue head dropper,So choose BD;O = HCl HClO,When the reaction occurs with the sodium hydroxide solution,Chlorine reacts with water first,The resulting hydrochloric acid, hydrochloric acid and sodium hydroxide react to generate sodium chloride, sodium chloride and water,So the reactants are chlorine and sodium hydroxide,The products are sodium chloride, sodium chloride and water,You can use the observation method to draw,O;According to the equation of the reaction of chlorine and sodium hydroxide, the ratio of liquid chlorine to caustic soda is: 35.5 × 2: 2 × 40 = 71: 80,O,It can be seen that two parts of sodium hydroxide are need

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The refrigeration unit is dry-the filter is located near? A compressor suction inlet B compressor outlet 50 When changing the compressor,The power of the new compressor should be as close as possible to the original compressor,Also pay attention to the shape, size and installation position of the new compressor,In order to facilitate the installation of fixed principle.However, the drying filter can not be replaced when replacing the compressor.The refrigerator changed the compressor to prove that the compressor was broken,Does not mean that the drying filter is bad,Can not change.Changing the compressor: 1. the new compressor cannot be inverted and collided during transportationDo not open the plug immediately after arriving at the scene;2. power-on again to review the status of the compressorAnd pay attention to whether the throttling device and filter are blocked,To determine whether the compressor needs to be processed together when replacing it,Especially dry noise filter;3. start preparing fluorine afte