ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿H2C2O4Ϊ¶þÔªÈõËá¡£20¡æʱ£¬ÅäÖÆÒ»×éc£¨H2C2O4£©+ c£¨HC2O4-£©+ c£¨C2O42-£©=0.100 mol¡¤L-1µÄH2C2O4ºÍNaOH»ìºÏÈÜÒº£¬ÈÜÒºÖв¿·Ö΢Á£µÄÎïÖʵÄÁ¿Å¨¶ÈËæpHµÄ±ä»¯ÇúÏßÈçÓÒͼËùʾ¡£ÏÂÁÐÖ¸¶¨ÈÜÒºÖÐ΢Á£µÄÎïÖʵÄÁ¿Å¨¶È¹Øϵһ¶¨ÕýÈ·µÄÊÇ£¨ £©
A£®pH=2.5µÄÈÜÒºÖУºc£¨H2C2O4£©+c£¨C2O42-£©£¾c£¨HC2O4-£©
B£®c£¨Na+£©£½0.100 mol¡¤L-1µÄÈÜÒºÖУºc£¨H+£©+c£¨H2C2O4£©£½c£¨OH-£©+c£¨C2O42-£©
C£®c£¨HC2O4-£©£½c£¨C2O42-£©µÄÈÜÒºÖУºc£¨Na+£©£¾0.100 mol¡¤L-1+c£¨HC2O4-£©
D£®pH=7µÄÈÜÒºÖУºc£¨Na+£©£¾2c£¨C2O42-£©
¡¾´ð°¸¡¿BD
¡¾½âÎö¡¿
ÊÔÌâ·ÖÎö£ºA¡¢¸ù¾ÝͼÏñÖªpH£½2.5µÄÈÜÒºÖУºc£¨H2C2O4£©+ c£¨C2O42-£©£¼ c£¨HC2O4-£©£¬A´íÎó£»B£®¸ù¾ÝÎïÁÏÊغãºÍµçºÉÊغã·ÖÎöc£¨Na+£©£½0.100 mol¡¤L-1µÄÈÜÒºÖУºc£¨H+£©+c£¨H2C2O4£©£½c£¨OH-£©+ c£¨C2O42-£©£¬BÕýÈ·£»C¡¢¹Ø¼üͼÏñ¿ÉÖªc£¨HC2O4-£©£½c£¨C2O42-£©µÄÈÜÒºÏÔËáÐÔ£¬ÈÜҺΪµÈÎïÖʵÄÁ¿Å¨¶ÈµÄ²ÝËáÇâÄƺͲÝËáÄƵĻìºÏÈÜÒº£¬ÔÚÈÜÒºÖУºc£¨Na+£©£½0.100 mol¡¤L-1+ c£¨HC2O4-£©£¬C´íÎó£»D¡¢ÓÉͼÏñÖªpH£½7µÄÈÜҺΪ²ÝËáÄÆÈÜÒº£¬²ÝËá¸ùË®½â£¬c£¨Na+£©£¾2c£¨C2O42-£©£¬DÕýÈ·¡£´ð°¸Ñ¡BD¡£