10-1. 已知 H 3 PO 4 的 K a 1 = 7.5 ́ 10 -3 , K a 2 = 6.2 ́ 10 -10 , K a 3 = 4.4 ́ 10 -13 ,将 Na 2 HPO 4 和 Na 3 PO 4 溶解在水中,其物质的量浓度相同,此溶液的 [H + ] A. 7.1 ́ 10 -3 B. 6.0 ́ 10 -8 C. 4.3 ́ 10 -10 D. 4.4 ́ 10 -13
【简答题】______statement can perform. a calculation and store the result in a variable So that it can be used later. A.Assignment B.Control C.I/O D.Declaration A. B. C. D.