高壓下氧氣在水中溶解度計算、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，不過時間長了，可能已經(jīng)被氧化掉了你可以按照水的溶解度計算補充回答：氧在水中的溶解度和溶解氧值是兩個既相區(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。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污染物的氧化作用等因素有關。這兩個概念之間的差異是由于大氣和水體界面間氧氣傳質(zhì)動力過程較慢而引起的。氧在水中的溶解度若已知當25 c下水蒸氣在空氣中含量為 0.0313摩爾分數(shù)以及干空氣中

2、含 20.95 %02時，則可應用道爾頓分壓定律和亨利定律算出標準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 （相當于 8.4mg/L ）由（4-2）式可導出在定壓條件下溫度對氧氣在水中溶解度影響的關系式：1 C2 AH 11 ,5 g 2 303R 工 Ta 式中C1和C2 分別為絕對溫度 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 分別為標準氣壓和 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 （相當于 8.4mg/L ） N2 ： 8.93 10-4mol/LC2：現(xiàn)在增壓罐壓力 0.8MPa,即8.0X05Pa,計算得：C2=21.356M0-4moL/L=0.1367g/L=0.0478L/L ,約 100L 水溶解 4.78L 氧氣計算得：C2=72.5lM0-4moL/L=0.203g/L=0.1624L/L,約

4、 100L水溶解 16.24L氮氣飽和蒸氣壓飽和蒸氣壓(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，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，乙醇為222647.74Pa 。飽和蒸氣壓是液體的一項重、

5、 ，,、/要物埋住偵 ，如故件削 拂點、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