硼砂與水的反應(yīng)是: B4O72-+5H2O=2H3BO3+2H2BO3- 用硼砂標(biāo)定HCl時,硼砂與HCl的化學(xué)計量比為()
A.1:1 B.1:2 C.1:4 D.1:5
A.1.3 B.0.96 C.0.64 D.0.32
A.0.1g左右 B.0.2g~0.4g C.0.4g~0.8g D.1.2g~2.4g