https://doi.org/10.1093/nar/gkac712
解答:解:A.常温下,测得NaR溶液的pH>7,说明NaR为强碱弱酸盐,水解呈碱性,可证明HR为弱酸,故A不选; B.常温下,将pH=1的HR溶液稀释100倍,测得pH<3,说明加水稀释促进电离,如为强酸,稀释后pH=4,可证明为弱酸,故B不选; C.溶液的导电性取决于溶液的离子浓度大小,由于二者的浓度大小未知,则不能确定酸的强弱,...
Kachkanar Mine is located in the town with the same name, 250 km away from the city of Ekaterinburg in the north of the central Ural region. The ore deposit contains the proven reserves of 3.2 billion tons of titan-magnetite, which at the current rate of extraction of 46.5M tons per ye...