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1 ��

1.1 ��ԭ��Ҫ��O3��һ�N��(qi��ng)��c�⻯⛣�KI��ˮ��Һ��(y��ng)��x��,��ȡ�ӽY(ji��)��Һ�ữ��,��0.1000mol/L��c��Na2S2O3��(bi��o)��(zh��n)��Һ��Ե��Һ��ָʾ��x��M(j��n)�ζ��(j��)��c��(bi��o)��(zh��n)��Һ��Ӌ(j��)��,��䷴��(y��ng)ʽ�飺

O3+2KI+H2O——O2+I2+2KOH(1)

I2+2Na2S2O3——2NaI+Na2S4O6(2)

1.2 ԇ��

1.2.1 �⻯�(KI)��Һ(20%)��ܽ�200g�⻯�(��)��1000mL��к��s��sˮ��,��ɫƿ��ڱ��,��ك��һ��á��Һ1.00mL��0.20g�⻯�,��

1.2.2 (1+5)��(H2SO4)��Һ��ȡ��(p=1.84,��)��5��w�e��sˮ�С�

1.2.3 C(Na2S2O3·5H2O)=0.1000mol/L��c��(bi��o)��(zh��n)��Һ,��ʹ�÷��ƽ��(zh��n)�_�Qȡ24.817g��c(Na2S2O3·5H2O��)��s��sˮ��1000mL��ƿ��,�,��Qȡ25g��c(Na2S2O3·5H2O��)��1000mL��s��sˮ��,��Һ��c��ȼs��0.1mol/L,��ټ��0.2g̼��c(Na2S0O3)��5mL��ȼ��(CHCL3)��(bi��o)��,��{(di��o)��ȵ�0.1000mol/L,��A��ɫƿ�У��ĕr�g�^�L�r,��ʹ��ǰ��Ҫ��(bi��o)��(bi��o)��Ҋ��A��,��

1.2.4 ��Һ��Qȡ1g��Ե��,��ˮ�{(di��o)�ɑҸ��{,��Ȼ��s80mL��ˮ�У�߅��߅��,��ϡጵ�100mL,��Ў׷�犺��ó��^ҹ��ȡ��Һʹ��,��^�L�r�g��ɼ��1.25gˮ��0.4g�Ȼ��\,��

1.3 ԇ�(y��n)�x��O(sh��)�估��Ҫ��

1.3.1 ��ϴƿ��ƿ��500mL,��

1.3.2 �ζ��50mL,��þ��ܵζ��ܡ�

1.3.3 ��ʽ��w��Ӌ(j��) ��5L,��

1.3.4 ��Ͳ 20mL 500mL ��һֻ,��

1.3.5 �̶��ܣ��ܣ�10mL ��

1.3.6 ��ƿ 1000mL,��

1.3.7 ��ϩ��ϩܛ��,��ݔ�ͺ��Ě��w��ʹ��z��,��

1.4 ��(sh��)�(y��n)��򼰷��ȡ20mL�ĵ⻯��Һ(3.1.2.1),��500mL��ƿ��,��ټ��350mL��sˮ��l(f��)��\(y��n)�з�(w��n)��ڳ��w��̎ȡ��,��ͨ��ƿ(3.1.3.1)��M(j��n)��պ��ͨ�^��ʽ��w��Ӌ(j��)(3.1.3.3)��wӋ(j��)��,��wͨ�^��2000mL��r�g��4min��ң��ֹͣȡ�Ӻ��5mL(1+5)��Һ(3.1.2.2)(ʹpHֵ��2.0��)��u��,��o��5min,��0.1000mol/L��c��(bi��o)��(zh��n)��Һ(3.1.2.3)�ζ��Һ�ʜ\�Sɫ�r��Һ(3.1.2.4)�׵�(�s1mL),��^�m(x��)С��Ѹ�ٵĵζ��ɫ��ʧ��ֹ,��ӛ��c��(bi��o)��(zh��n)��Һ��

1.5 ��ȵ�Ӌ(j��)��

Co3=ANa×B×2400/V0(mg/L) (3)

ʽ�У�Co3——��,��mg/L,��

ANa——��c��(bi��o)��(zh��n)��Һ��mL,��

B ——��c��(bi��o)��(zh��n)��Һ��,��mol/L��

V0 ——��wȡ��w�e,��mL,��

��ȴ��ڵ��3mg/L�r��˜yԇ�Y(ji��)��ľ��ܶ��±1%�ԃ�(n��i),��

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