Which of the following experiments uses the self-indicator method?
A. Standardization KMnO4 solution
B. Standardization NaOH solution
C. Standardization Na2S2O3 solution
Determination of the content of ammonium chloride
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When determine the concentration of H2O2 with KMnO4 solution, which can be used to control acidity? （ ）。
A. HNO3
B. HCl
C. HAc
D. H2SO4
Which indicator is used in the determination of H2O2 （ ）
A. KMnO4
B. Phenolphthalein indicator
C. Eriochrome Black T
D. methyl orang indicator
用草酸钠标定KMnO4溶液时，滴定至终点的颜色为（）
A. 紫色
B. 淡蓝色
C. 橙红色
D. 淡红色
测定NH4Cl的含量，用到的指示剂为( )
A. 荧光黄
B. 曙红
C. 酚酞
D. 二甲基二碘荧光黄
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