�x�ӽ��Q��֬��ʹ��c��B(y��ng)

��r�g��2011-06-29 16:11 ��Դ�� : ��x��681

��_��ʹ��x�ӽ��Q��֬,��L��֬��C��֬��(w��n)��ɿ�,��ʮ��Ҫ��x��֬��ʹ��c��B(y��ng)��棺

һ,��֬�A̎��

��ںϳɘ�֬�^��,��֬��漰��϶�л쓽�еͷ��Ӻ�һЩ�o�C�s�|(zh��)��~��F�ȣ�,��߷��ӆ��w��|(zh��),��Լ��¿ׄ��ȣ��˘�֬��ʽͶ��\��֮ǰ,��회��@Щ�s�|(zh��)��ȥ,��t��ʹ��^��Е��Ը��N��ʽ��Ⱦ��֬��؄e��(y��ng)��ָ��,��ں��t�Uˮ��,��t��һ�N��,��֬��~��F,��д߻��,��Ķ��ӿ��֬��A̎��£�

1,��ˮϴ��

�ʂ�ʹ�õ��֬��ß�ˮ��ϴ,��ꖘ�֬��70��80��ğ�ˮ��ꎘ�֬��؄e�Ǐ��Aꎘ�֬��͟��^��,��50��60��ğ�ˮ,��_ʼ��ϴ�r��ÿ��15��ғQˮһ��,��ϴ�rҪ��ǔ��,��Qˮ4��5�κ󣬿ɸ�30��ғQˮһ��,��Qˮ7��8��,��ϴ��ˮ��ɫ��ĭ��ٕr��ֹ,��

2,��ᡢ�A̎��

��֬�ß�ˮϴ��b��M��,��,��A̎��ꖘ�֬��1mol/1HCL��^��֬��,��s��֬�w�e��2��3��,��s2С�r��꣬��ˮ��ϴ��,��1mol/1NaOH��^��֬��,��ͬǰ��A��,��ˮ��ϴ��ˮph9��,��1mol/1HCL��0.5mol/1H2SO4��֬�D(zhu��n)��H+�ͣ��֬�w�e��3��4��,��cǰͬ,��ˮ��ϴ��ˮph6��ϕr,��Ͷ��\��,��

��֬�ı��B(y��ng)

��֬��ʹ��^��Б�(y��ng)��ֹ�Ҹ��,��ЙC�Ｐ��ȵ��Ⱦ,��ͬ�r��Ҫ��ֹĳЩ�Uˮ��֬�Ą��,��ˣ��Uˮ�M��ꎘ�֬ǰ��(y��ng)ȥ��ؽ��x��,��Է�ֹ�ؽ��ٌ��֬�Ĵ߻��,��ÿ��O(sh��)��\��ꮅ��(y��ng)��Q��ЏUˮ�Ż؏Uˮ�أ��֮��ԁ�ˮ��ˮ��,��֬ͺ�Ҫ��r��,��L��ԭҺ�н��ͣ�ţ��(y��ng)��r��ϴ�Ƀ�,��

��,��֬�

�oՓ��ꖘ�֬��ꎘ�֬��ʹ��ں�,��l(f��)��Q��½��ĬF(xi��n)��,��½��ԭ��һ��ڲ��ò��ȫ��,��֬��һ��δ��x��u�۷e,��Ӱ푽��Q��M�У��һ��,��纬�t�Uˮ�е�H2CrO4��H2Cr2O7�Ȍ��֬��,��ʹ��֬��Cr3+Խ��Խ�࣬Ӱ푘�֬��,��,��֬��@��½��څ�ݕr��(y��ng)�M�И�֬�Ļ,��

1,��ꎘ�֬�Ļ

ꎘ�֬�Ļ��ʩ��(y��ng)ҕ��̎��ďUˮ��,��(n��i)��̎��t�Uˮ��ꎘ�֬��б��^�ɹ��Ľ�(j��ng)�,��ԭ��£��ꎘ�֬��֮��,��2��2.5mol//1H2SO4��Һ��,��Ȼ��씇��¼��NaHSO3��֬�ϵ�Cr6+߀ԭ��Cr3+,��֬��Һ�н��һ��ҹ,��Ȼ��ˮϴ��^��؏�1��2�~,��Ɍ��֬�е�Cr6+��Cr3+��ȥ,��NaOH�D(zhu��n)�ʹ��á�

2,��ꖘ�֬�Ļ

ꖘ�֬���ҪĿ��ȥ��֬��۷e��ؽ��x��,��Щ�c��֬�Y(ji��)��^��ĸ߃r��x��,��Fe3+��Cr3+��,�,��w��(n��i)���Һ��2��֬�w�e,��F(xi��n)�Ý�Ȟ�3.0mol/1��}��,��ͨ�^��֬�ӣ��1��2��֬�w�e,��Ȟ�2.0��2.5mol/1��Һ��ݘ�֬,��v�rһ��ҹ��8С�r��֬�е�Fe3+,��Cr3+��ؽ��x�ӱ��ȥ��,��ϴ��֬��ɴ��á�

����D(zhu��n)�d��ǳ��ڂ��f��Ϣ֮Ŀ��,��Ё�Դ��ע�e�`��ַ��ĺϷ��(qu��n)��,��Ո��߳֙�(qu��n)��C��c��W(w��ng)(li��n)ϵ��҂��r��,��h��,��x�x��