实验五海水的pH值和碱度的测量

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1、实验4海水的pH值和总碱度的测量陈志刚海水pH值的测定pH的定义？海水的pH范围？研究意义？7.0-8.5Why?根据能斯特方程式，在一定条件下，电池电动势与水样的pH值之间存在以下线性关系：当玻璃电极和甘汞电极对插入标准缓冲溶液时，则得：原理在同一温度下，分别测定同一电极对在标准缓冲溶液和水样中的电动势，则水样的pH值为：气体常数8.314J•K-1•mol-1法拉第常数9.648531×104C•mol-1热力学温度(K)标准缓冲溶液：邻苯二甲酸氢钾（25℃）：4.003混合磷酸（25℃）：6.864十水四硼酸钠（25℃）：9.1

2、82测定步骤：一、pH值的校准打开仪器连通电源，电极插头与仪器电极插座连接，预热30分钟。将仪器选择开关拨至pH档将温度调至当前温度（25℃）用蒸馏水冲洗电极，并使用洁净滤纸吸干水分将电极浸入pH=6.864的标准缓冲溶液瓶，将斜率旋钮置100%处(顺时针旋到底)，摇动瓶子，待平衡后调定位旋钮至显示6.86取出电极，用蒸馏水冲洗电极，并使用洁净滤纸吸干水分将电极浸入pH=4.003的标准缓冲溶液瓶，摇动瓶子，待平衡后调斜率旋钮，至显示4.00保持斜率、定位旋钮不动核准，再次浸入pH=6.864的标准缓冲溶液瓶，看读数是否一致，若不一致

3、，重复定位和调斜率步骤取出电极并用蒸馏水洗干净，并用洁净滤纸吸干水分，放入保护液中或直接测定样品二、水样pH的测量：调准后，取出电极用蒸馏水洗净，并用洁净滤纸吸干水分将电极侵入待测溶液，摇动瓶子，待平衡后，可从显示器读出样品的pH值测量完毕后，取出电极并用蒸馏水洗干净，并用洁净滤纸吸干水分，放入保护液中不单独做，在碱度试验中一起测定计算现场温度℃深度m温度校正系数压力校正系数测定时的温度℃t'w-twpH7.57.67.77.87.98.08.18.28.38.48.58.610.010.010.010.010.010.010.010

4、.010.010.010.010.0120.020.020.020.020.020.020.020.020.020.020.020.0230.030.030.030.030.030.030.030.030.030.030.030.0440.030.030.040.040.040.040.040.040.040.050.050.0550.040.040.040.050.050.050.050.050.060.060.060.0660.050.050.050.060.060.060.060.060.070.070.070.0770.060

5、.060.060.070.070.070.070.070.080.080.080.0880.070.070.070.070.080.080.080.080.090.090.090.190.070.080.080.080.090.090.090.10.10.10.10.11100.080.090.090.090.10.10.10.110.110.110.120.12110.090.090.10.10.110.110.110.120.120.120.130.13120.10.10.110.110.120.120.120.130.130.1

6、40.140.14130.110.110.120.120.120.130.130.140.140.150.150.16140.120.120.130.130.130.140.140.150.150.160.160.17150.130.130.140.140.140.150.150.160.160.170.170.18160.130.140.140.150.150.160.160.170.180.180.190.19170.140.150.150.160.160.170.180.180.190.190.20.2180.140.150.1

7、60.170.170.180.190.190.20.20.210.22190.150.160.170.180.180.190.20.20.210.210.220.23200.160.170.180.190.190.20.210.210.220.230.230.24210.170.180.190.20.20.210.220.220.230.240.240.25220.180.190.20.20.210.220.230.230.240.250.260.26230.190.20.210.210.220.230.240.240.250.260

8、.270.28240.20.210.220.220.230.240.250.250.260.270.280.29250.210.220.220.230.240.250.260.260.280.280.290.3表1，pH