计算0.1mol£¯L（NaOH)氢氧化钠溶液的PH值？

A.酚酞

B.溴甲酚绿

C.甲基橙

D.溴酚蓝

E.百里酚蓝

A.2.00

B.3.00

C.10.00

D.20.00

E.30.00

A.加水

B.加NaAc

C.加NaOH

D.加0.1mol/L HCl

E.加0.1mol/L H₂SO₄

A.100mL 1mol/L HAc+100mL 1mol/L NaOH

B.100mL 1mol/L HCl+200mL 2mol/L NH₃·H₂O

C.200mL 1mol/L HAc+100mL 2mol/L NaOH

D.100mL 1mol/L NH₄Cl+100mL 1mol/L NH₃·H₂O

E.100mL 5mol/L NaOH+100mL 0.1mol/L HCl

标定0.1mol/L的NaOH溶液时，将滴定的体积控制在25mL左右。若以邻苯二甲酸氢钾(摩尔质量为204.2g/mol)为基准物质，应称取______g。若改用草酸(摩尔质量为126.1g/mol)为基准物质，应称取______g。

A.0.25g左右

B.0.4g左右

C.1g左右

D.0.1g左右

E.0.7g左右

A.21%

B.26%

C.31%

D.36%

E.41%

A.21%

B.26%

C.31%

D.36%

E.41%