將25.6gNaCl和MgCl2固體混合物完全溶于126g水中配成溶液,再將200g一定溶質(zhì)質(zhì)量分?jǐn)?shù)的NaOH溶液不斷加入到該溶液中,充分反應(yīng)后,測得的實(shí)驗(yàn)數(shù)據(jù)如表:
實(shí)驗(yàn)次數(shù) |
1 |
2 |
3 |
4 |
5 |
加入NaOH溶液質(zhì)量/g |
40 |
40 |
40 |
40 |
40 |
共生成沉淀的質(zhì)量/g |
2.9 |
5.8 |
m |
11.6 |
11.6 |
求:(1)表中m的值為
8.7
8.7
.
(2)恰好完全反應(yīng)時(shí),所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)?
(3)固體混合物中NaCl的質(zhì)量分?jǐn)?shù)
25.8%
25.8%
(結(jié)果保留一位小數(shù))