小蘇打和堿(jian)(jian)(jian)(jian)(jian)(jian)不(bu)(bu)是一(yi)回事！鈉的(de)重要(yao)(yao)化(hua)合物(wu)是"純(chun)(chun)堿(jian)(jian)(jian)(jian)(jian)(jian)"--俗(su)稱(cheng)碳酸(suan)鈉"蘇(su)(su)(su)打(da)(da)(da)(da)"。起初，人(ren)們(men)從一(yi)些海生植(zhi)物(wu)的(de)灰(hui)中提(ti)取蘇(su)(su)(su)打(da)(da)(da)(da)水，但產量(liang)非常(chang)有(you)(you)限。現在，人(ren)們(men)用(yong)鹽、硫酸(suan)和石(shi)灰(hui)石(shi)作為(wei)(wei)(wei)制(zhi)造純(chun)(chun)堿(jian)(jian)(jian)(jian)(jian)(jian)的(de)原料。中國化(hua)學(xue)工作者(zhe)侯德榜先生對純(chun)(chun)堿(jian)(jian)(jian)(jian)(jian)(jian)的(de)制(zhi)造方(fang)法進行了重大改進，并(bing)建立了聯合堿(jian)(jian)(jian)(jian)(jian)(jian)制(zhi)造方(fang)法。純(chun)(chun)堿(jian)(jian)(jian)(jian)(jian)(jian)是一(yi)種經常(chang)用(yong)于清洗的(de)白色(se)晶體(ti)"洗濯蘇(su)(su)(su)打(da)(da)(da)(da)"。玻璃、肥皂(zao)、造紙、石(shi)油(you)等行業消(xiao)耗(hao)數千噸(dun)純(chun)(chun)堿(jian)(jian)(jian)(jian)(jian)(jian)。"小(xiao)(xiao)蘇(su)(su)(su)打(da)(da)(da)(da)"，俗(su)稱(cheng)碳酸(suan)氫鈉。治療胃病的(de)小(xiao)(xiao)蘇(su)(su)(su)打(da)(da)(da)(da)片，"蘇(su)(su)(su)打(da)(da)(da)(da)餅干"，使用(yong)它。小(xiao)(xiao)蘇(su)(su)(su)打(da)(da)(da)(da)是一(yi)種微咸(xian)的(de)小(xiao)(xiao)白色(se)晶體(ti)。它通常(chang)被用(yong)作發(fa)(fa)酵(jiao)劑(ji)。由于它受熱或受酸(suan)，很容易釋放二氧(yang)(yang)化(hua)碳氣體(ti)，在面(mian)團中形成蜂窩(wo)狀。有(you)(you)人(ren)說純(chun)(chun)堿(jian)(jian)(jian)(jian)(jian)(jian)（蘇(su)(su)(su)打(da)(da)(da)(da)）可(ke)以代替小(xiao)(xiao)蘇(su)(su)(su)打(da)(da)(da)(da)，因(yin)為(wei)(wei)(wei)它們(men)都(dou)是堿(jian)(jian)(jian)(jian)(jian)(jian)性鹽，主(zhu)要(yao)(yao)用(yong)于去除(chu)發(fa)(fa)酵(jiao)過(guo)程(cheng)中產生的(de)酸(suan)。然(ran)而，純(chun)(chun)堿(jian)(jian)(jian)(jian)(jian)(jian)（蘇(su)(su)(su)打(da)(da)(da)(da)）有(you)(you)澀味，小(xiao)(xiao)蘇(su)(su)(su)打(da)(da)(da)(da)有(you)(you)咸(xian)味。純(chun)(chun)堿(jian)(jian)(jian)(jian)(jian)(jian)(蘇(su)(su)(su)打(da)(da)(da)(da))發(fa)(fa)酵(jiao)時(shi)能(neng)代替小(xiao)(xiao)蘇(su)(su)(su)打(da)(da)(da)(da)嗎？發(fa)(fa)酵(jiao)過(guo)程(cheng)主(zhu)要(yao)(yao)利用(yong)小(xiao)(xiao)蘇(su)(su)(su)打(da)(da)(da)(da)易分(fen)(fen)解，易釋放二氧(yang)(yang)化(hua)碳，起到蓬(peng)松的(de)作用(yong)。如果(guo)用(yong)蘇(su)(su)(su)打(da)(da)(da)(da)，蘇(su)(su)(su)打(da)(da)(da)(da)不(bu)(bu)分(fen)(fen)解，就(jiu)不(bu)(bu)能(neng)替代。這(zhe)就(jiu)是為(wei)(wei)(wei)什么(me)做糕點(dian)生意的(de)人(ren)從來不(bu)(bu)用(yong)過(guo)期的(de)小(xiao)(xiao)蘇(su)(su)(su)打(da)(da)(da)(da)，因(yin)為(wei)(wei)(wei)過(guo)期小(xiao)(xiao)蘇(su)(su)(su)打(da)(da)(da)(da)的(de)主(zhu)要(yao)(yao)成分(fen)(fen)是蘇(su)(su)(su)打(da)(da)(da)(da)，所以兩(liang)者(zhe)是不(bu)(bu)一(yi)樣(yang)的(de)！