Potassium carbonate, white crystalline powder. The density was 2.428g/cm3. Melting point 891 ℃, boiling point decomposition, relative molecular weight 138.21. Soluble in water, the aqueous solution is alkaline, insoluble in ethanol, acetone and ether. It has strong hygroscopicity, can absorb carbon dioxide and moisture when exposed to the air and convert into potassium bicarbonate. There are monohydrate, dihydrate and trihydrate. The aqueous solution of potassium carbonate is alkaline. It is insoluble in ethanol and ether.

1.碳酸钾可用于玻璃、印染、肥皂、搪瓷、制备钾盐、合成氨脱羰，也用于彩色电视机工业,主要用于食品中作膨松剂。

1. Potassium carbonate can be used in glass, printing and dyeing, soap, enamel, preparation of potassium salt, synthesis of ammonia decarbonylation, also used in color TV industry, mainly used as a leavening agent in food.

2.主要用于分析试剂。如高纯分析、发射光谱分析等。也可用于硅酸盐和不溶性硫酸盐的助熔剂，有机液体的吸水剂及电镀、化肥、照相行业。

2. Mainly used for analytical reagent. Such as high purity analysis, emission spectrum analysis and so on. It can also be used as flux of silicate and insoluble sulfate, absorbent of organic liquid, electroplating, fertilizer and photography.

3.用于玻璃、印染、肥皂、搪瓷、制备钾盐、合成氨脱羰，彩色电视机工业,食品中作膨松剂;作气体吸附剂、干粉灭火剂、橡胶防老剂等;用于已曝光的感光材料的冲洗加工。

3. Used in glass, printing and dyeing, soap, enamel, preparation of potassium salt, synthesis ammonia decarbonylation, color television industry, food as leavening agent; as gas adsorbent, dry powder fire extinguishing agent, rubber antioxidant, etc.; used for the processing of exposed photosensitive materials.

4.用于电子工业显像管玻壳的制造、化肥脱碳、钾盐制造，用作分析试剂、助熔剂，也用于各种钾盐的制备;用于分析试剂、基准试剂及熔融硅酸盐和不溶性硫酸盐的助熔剂。

4. It is used in the manufacture of electronic industry picture tube glass shell, chemical fertilizer production, decarburization, potassium salt manufacturing, as analytical reagent, flux, and preparation of various potassium salts; used as analytical reagent, reference reagent and flux for molten silicate and insoluble sulfate.

5.化学实验中做干燥剂。其吸水能力中等，能形成带两个结晶水的碳酸钾(K2CO3·2H2O），但是与水作用较慢。适用于干燥醇、酯等中性有机物以及一般的碱性有机物如胺、生物碱等。但不能作为酸类、酚类或其他酸性物质的干燥剂。

5. Desiccant in chemical experiment. It can form potassium carbonate (K2CO3 · 2H2O) with two crystal water, but the interaction with water is slow. It is suitable for drying neutral organic substances such as alcohols and esters, and general basic organic substances such as amines and alkaloids. But it can not be used as desiccant for acids, phenols or other acidic substances.

6.碱性剂和面团改良剂，且可抑制面条发酸，可用于面制食品，按需要适量使用。用于光学玻璃，可提高玻璃透明度、强度和折光系数。

6. Alkaline agent and dough improver, and can inhibit noodle acid, can be used in flour food, according to the production needs of appropriate use. It can improve the transparency, strength and refractive index of optical glass.