高壓下氧氣在水中溶解度計(jì)算、飽和蒸汽壓

1、在25Mpa壓力下，液體中的溶解氧是多少?就是水，里面加了一些殺菌劑和防腐劑，不過(guò)時(shí)間長(zhǎng)了，可能已經(jīng)被氧化掉了你可以按照水的溶解度計(jì)算補(bǔ)充回答：氧在水中的溶解度和溶解氧值是兩個(gè)既相區(qū)別而又相聯(lián)系的概念。氧在水中的溶解度指的是水體和大氣處于平衡時(shí)氧的最大溶解濃度，它的數(shù)值與溫度、壓力、水中溶質(zhì)量等因素有關(guān)。水中溶解氧值則一般是指非平衡狀態(tài)下的水中溶解氧的濃度。它的數(shù)值與水體曝氣作用、光合作用、呼吸作用及水中有機(jī)污染物的氧化作用等因素有關(guān)。這兩個(gè)概念之間的差異是由于大氣和水體界面間氧氣傳質(zhì)動(dòng)力過(guò)程較慢而引起的。氧在水中的溶解度若已知當(dāng)25 c下水蒸氣在空氣中含量為 0.0313摩爾分?jǐn)?shù)以及干空氣中

2、含 20.95 %02時(shí)，則可應(yīng)用道爾頓分壓定律和亨利定律算出標(biāo)準(zhǔn)條件下氧在水中溶解度O2（aq）:O2（aq） =Ko2 po2=1.28 X10-8 X （1.0000-0.0313 ） 0X1.013 M05 92095=2.63 X10-4mol/L （相當(dāng)于 8.4mg/L ）由（4-2）式可導(dǎo)出在定壓條件下溫度對(duì)氧氣在水中溶解度影響的關(guān)系式：1 C2 AH 11 ,5 g 2 303R 工 Ta 式中C1和C2 分別為絕對(duì)溫度 T1和T2下氣體在水中溶解度（mg/L ）;H溶解熱（J/mol ）;R 氣體常數(shù)（8.314J/K mol）。壓力對(duì)氧氣在水中溶解度的影響可用下列公式表述

3、：£1生工_（3加1013X10-，式中C1和C2 分別為標(biāo)準(zhǔn)氣壓和 P2氣壓下氧氣在水中的溶解度（ mg/L ）;p確定溫度下飽和水蒸氣的壓力（p和P2的單位為帕）。P:25c水飽和蒸汽壓為3.169 103PaC1: =2.63 X10-4mol/L （相當(dāng)于 8.4mg/L ） N2 ： 8.93 10-4mol/LC2：現(xiàn)在增壓罐壓力 0.8MPa,即8.0X05Pa,計(jì)算得：C2=21.356M0-4moL/L=0.1367g/L=0.0478L/L ,約 100L 水溶解 4.78L 氧氣計(jì)算得：C2=72.5lM0-4moL/L=0.203g/L=0.1624L/L,約

4、 100L水溶解 16.24L氮?dú)怙柡驼魵鈮猴柡驼魵鈮?saturated 液體或固體處于相平衡的蒸 不同的蒸氣壓，并隨著溫度的升vapor pressure )在密閉條件中，在一定 溫度 下，與:氣所具有的 壓力稱為飽和蒸氣壓。同一 物質(zhì)在不同溫度卜-后 局也增大。小向液體飽和烝汽壓小向，溶質(zhì)的飽和烝汽壓大于溶液的飽和蒸汽壓；對(duì)于同一物質(zhì)，固態(tài)的飽和蒸汽壓大于液態(tài)的飽和蒸汽壓。例如，在30 c時(shí)，水的飽和蒸氣壓為水的飽和蒸氣壓增大到101324.72Pa,4132.982Pa, 乙醇 為 10532.438Pa 。而在 100 C時(shí)，乙醇為222647.74Pa 。飽和蒸氣壓是液體的一項(xiàng)重、

5、 ，,、/要物埋住偵 ，如故件削 拂點(diǎn)、放件 混行物 削伯刈推及度寺郁與之侶大。曲線水在/、同溫度卜的飽和烝氣壓Saturated Water VaporDifferent Temperatures飽和烝氣壓Pressures at飽和蒸氣壓飽和蒸氣壓飽和蒸氣壓溫度溫度溫度(Saturated(Saturated(Saturated(Temperatur(Temperatur(Temperature)water vapore)water vapore)water vaporpressure)pressure)pressure)t/Ct/t/( X10A3 Pa)/(x10A3Pa)/( X10

6、A3 Pa)00.61129125232.012503973.610.65716126239.242514041.220.70605127246.662524109.630.75813128254.252534178.940.81359129262.042544249.150.87260130270.022554320.260.93537131278.202564392.271.0021132286.572574465.181.0730133295.152584539.091.1482134303.932594613.7101.2281135312.932604689.4111.3129136

7、322.142614766.1121.4027137331.572624843.7131.4979138341.222634922.3141.5988139351.092645001.8151.7056140361.192655082.3161.8185141371.532665163.8171.9380142382.112675246.3182.0644143392.922685329.8192.1978144403.982695414.3202.3388145415.292705499.9212.4877146426.852715586.4222.6447147438.672725674.

8、0232.8104148450.752735762.7242.9850149463.102745852.4253.1690150475.722755943.1263.3629151488.612766035.0273.5670152501.782776127.9283.7818153515.232786221.9294.0078154528.962796317.2304.2455155542.992806413.2314.4953156557.322816510.5324.7578157571.942826608.9335.0335158586.872836708.5345.322915960

9、2.112846809.2355.6267160617.662856911.1365.9453161633.532867014.1376.2795162649.732877118.3386.6298163666.252887223.7396.9969164683.102897330.2407.3814165700.292907438.0417.7840166717.832917547.0428.2054167735.702927657.2438.6463168753.942937768.6449.1075169772.522947881.3459.5898170791.472957995.24

10、610.094171810.782968110.34710.620172830.472978226.84811.171173850.532988344.54911.745174870.982998463.55012.344175891.803008583.85112.970176913.033018705.45213.623177934.643028828.35314.303178956.663038952.65415.012179979.093049078.25515.7521801001.93059205.15616.5221811025.23069333.45717.3241821048

11、.93079463.15818.1591831073.03089594.25919.0281841097.53099726.76019.9321851122.53109860.56120.8731861147.93119995.86221.8511871173.8312101336322.8681881200.1313102716423.9251891226.1314104106525.0221901254.2315105516626.1631911281.9316106946727.3471921310.1317108386828.5761931338.8318109846929.85219

12、41368.0319111317031.1761951397.6320112797132.5491961427.8321114297233.9721971458.5322115817335.4481981489.7323117347436.9781991521.4324118897538.5632001553.6325120467640.2052011568.4326122047741.9052021619.7327123647843.6652031653.6328125257945.4872041688.0329126888047.3732051722.9330128528149.32420

13、61758.4331130198251.3422071794.5332131878353.4282081831.1333133578455.5852091868.4334135288557.8152101906.2335137018660.1192111944.6336138768762.4992121983.6337140538864.9582132023.2338142328967.4962142063.4339144129070.1172152104.2340145949172.8232162145.7341147789275.6142172187.8342149649378.49421

14、82230.5343151529481.4652192273.8344153429584.5292202317.8345155339687.6882212362.5346157279790.9452222407.8347159229894.3012232453.8348161209997.7592242500.534916320100101.322252547.935016521101104.992262595.935116825102108.772272644.635216932103112.662282694.135317138104116.672292744.235417348105120.792302795.135517561106125.032312846.735617775107108109110111112113114115116117118119120121122123124129.392322899.035717992133.882332952.135818211138.502343005.935918432143.242353060.436018655148.122363115.736118881153.132373171.836219110158.292383288.636319340163.5823932