�x�ӽ��Q��֬��ʹ��c��B(y��ng)

��r�g��2011-06-29 16:11 ��Դ�� : ��x��670

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

һ,��֬�A(y��)̎��

��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)��(d��ng)ָ��,��ں��t�Uˮ�У��t��һ�N��,��֬��~,��F��д߻��,��Ķ��ӿ��֬��,��A(y��)̎��£�

1��ˮϴ��

��(zh��n)��ʹ�õ��֬��ß�ˮ��(f��)��ϴ,��ꖘ�֬��70��80��ğ�ˮ,��ꎘ�֬��؄e�Ǐ��Aꎘ�֬��͟��^���50��60��ğ�ˮ,��_ʼ��ϴ�r,��ÿ��15��ғQˮһ�Σ��ϴ�rҪ��ǔ��,��Qˮ4��5�κ�,��ɸ�30��ғQˮһ�Σ��Qˮ7��8��,��ϴ��ˮ��ɫ,��ĭ��ٕr��ֹ��

2,��,��A̎��

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

��,��֬�ı��B(y��ng)

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

��,��֬�

�oՓ��ꖘ�֬��ꎘ�֬,��(d��ng)ʹ��ں󣬶��l(f��)��Q��½��ĬF(xi��n)��,��½��ԭ��,��һ��ڲ��ò��ȫ��֬��һ��δ��x��u�۷e,��Ӱ푽��Q��M��,��һ��棬��纬�t�Uˮ�е�H2CrO4��H2Cr2O7�Ȍ��֬��,��ʹ��֬��Cr3+Խ��Խ��,��Ӱ푘�֬��,��(d��ng)��֬��@��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��^��؏�(f��)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�ӣ��Fe3+,��Cr3+�ȡ,��w��(n��i)�,��Һ��2��֬�w�e��F(xi��n)�Ý�Ȟ�3.0mol/1��}��,��ͨ�^��֬��,��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��,��

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