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工(gong)業(ye)硫酸(suan)在使(shi)用(yong)(yong)(yong)前我(wo)們(men)必(bi)須(xu)進行含量(liang)(liang)測定,不(bu)然會影響我(wo)們(men)的使(shi)用(yong)(yong)(yong),甚(shen)至(zhi)會導致我(wo)們(men)浪費原(yuan)料,1、準(zhun)(zhun)備:根據工(gong)業(ye)硫酸(suan)樣(yang)(yang)(yang)品(pin)數(shu)量(liang)(liang),將(jiang)一(yi)(yi)定量(liang)(liang)蒸(zheng)餾水煮(zhu)沸并(bing)隔絕空(kong)氣(qi)冷卻,工(gong)業(ye)濃(nong)硫酸(suan)價格,現用(yong)(yong)(yong)。準(zhun)(zhun)確(que)移(yi)(yi)(yi)取(qu)(qu)(qu)50mL新煮(zhu)沸并(bing)冷卻的蒸(zheng)餾水加(jia)入到(dao)250mL錐形(xing)瓶(ping)(ping)(ping)(ping)中(zhong)(zhong)(zhong)。防止水中(zhong)(zhong)(zhong)溶解的CO2形(xing)成(cheng)弱酸(suan)消(xiao)耗滴(di)(di)(di)(di)定液(ye),結(jie)果增(zeng)大。2、稱(cheng)(cheng)(cheng)取(qu)(qu)(qu):使(shi)用(yong)(yong)(yong)干燥的膠頭滴(di)(di)(di)(di)管,小心(xin)的移(yi)(yi)(yi)取(qu)(qu)(qu)適量(liang)(liang)硫酸(suan)試樣(yang)(yang)(yang),轉移(yi)(yi)(yi)到(dao)相對應(ying)的滴(di)(di)(di)(di)瓶(ping)(ping)(ping)(ping)中(zhong)(zhong)(zhong),濃(nong)硫酸(suan),使(shi)用(yong)(yong)(yong)萬分(fen)之一(yi)(yi)天平(ping)準(zhun)(zhun)確(que)稱(cheng)(cheng)(cheng)量(liang)(liang)樣(yang)(yang)(yang)品(pin)及滴(di)(di)(di)(di)瓶(ping)(ping)(ping)(ping)的總質(zhi)量(liang)(liang),記為(wei)m1;從該(gai)滴(di)(di)(di)(di)瓶(ping)(ping)(ping)(ping)內移(yi)(yi)(yi)取(qu)(qu)(qu)數(shu)滴(di)(di)(di)(di)硫酸(suan)試樣(yang)(yang)(yang)于(yu)錐形(xing)瓶(ping)(ping)(ping)(ping)中(zhong)(zhong)(zhong),濃(nong)硫酸(suan)哪里有,再次稱(cheng)(cheng)(cheng)取(qu)(qu)(qu)樣(yang)(yang)(yang)品(pin)及滴(di)(di)(di)(di)瓶(ping)(ping)(ping)(ping)的總質(zhi)量(liang)(liang),記為(wei)m2;用(yong)(yong)(yong)差(cha)減(jian)法m1-m2算出(chu)移(yi)(yi)(yi)取(qu)(qu)(qu)的硫酸(suan)試樣(yang)(yang)(yang)的質(zhi)量(liang)(liang)m。質(zhi)量(liang)(liang)要求在0.7g左右。每一(yi)(yi)滴(di)(di)(di)(di)瓶(ping)(ping)(ping)(ping)的滴(di)(di)(di)(di)管是對應(ying)的。取(qu)(qu)(qu)完樣(yang)(yang)(yang)品(pin)后,立(li)即將(jiang)滴(di)(di)(di)(di)管放(fang)入對應(ying)的滴(di)(di)(di)(di)瓶(ping)(ping)(ping)(ping)中(zhong)(zhong)(zhong),防止工(gong)業(ye)硫酸(suan)吸收空(kong)氣(qi)中(zhong)(zhong)(zhong)的水,致使(shi)檢測結(jie)果偏低。3、滴(di)(di)(di)(di)定:將(jiang)盛試樣(yang)(yang)(yang)的錐形(xing)瓶(ping)(ping)(ping)(ping)搖勻,冷卻至(zhi)室溫(wen)后,立(li)即加(jia)入3滴(di)(di)(di)(di)紅(hong)—此(ci)藍混合指示劑,用(yong)(yong)(yong)NaOH標準(zhun)(zhun)溶液(ye)滴(di)(di)(di)(di)定至(zhi)溶液(ye)呈灰(hui)綠(lv)色為(wei)終點(dian)。
硫酸(suan)(suan)化(hua)學性(xing)(xing)質,純(chun)晶(jing)為(wei)無(wu)(wu)色(se)、無(wu)(wu)臭、透(tou)明的(de)油(you)狀(zhuang)液(ye)體,98%濃硫酸(suan)(suan)價格,呈強(qiang)(qiang)酸(suan)(suan)性(xing)(xing)。市(shi)售的(de)工業硫酸(suan)(suan)為(wei)無(wu)(wu)色(se)至(zhi)微黃色(se),甚至(zhi)紅(hong)棕色(se)。相對密度(du):98%硫酸(suan)(suan)為(wei)l.8365(20℃),93%硫酸(suan)(suan)為(wei)1.8276(20℃)。熔(rong)點10.35℃。沸點338℃。有(you)(you)很強(qiang)(qiang)的(de)吸水(shui)能(neng)力,與水(shui)可(ke)(ke)以按(an)不同比例混合,并放出大量的(de)熱。為(wei)無(wu)(wu)機強(qiang)(qiang)酸(suan)(suan),腐蝕(shi)性(xing)(xing)很強(qiang)(qiang)。化(hua)學性(xing)(xing)很活潑,兒乎能(neng)與所有(you)(you)金(jin)屬及其氧化(hua)物、氫氧化(hua)物反應(ying)生成(cheng)硫酸(suan)(suan)鹽,還(huan)能(neng)和其他無(wu)(wu)機酸(suan)(suan)的(de)鹽類作(zuo)用。在稀釋硫酸(suan)(suan)時,只(zhi)能(neng)注酸(suan)(suan)入(ru)水(shui),切不可(ke)(ke)注水(shui)入(ru)酸(suan)(suan).以防酸(suan)(suan)液(ye)表面局部過熱而發生噴(pen)酸(suan)(suan)事(shi)故。濃度(du)低于76%的(de)硫酸(suan)(suan)與金(jin)屬反應(ying)會放出氫氣。
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