Solution X is pre pared by mixing 100.0 cm3 of 2.50 mol dm-3 Na2CO3(aq) with 150.0 cm3 of 1.00 mol dm-3 NaCL(aq). What is the concentration of Na+(aq) ions in X ?
要例埋識!唔該!
(CHEM)唔識計concentration
2011-06-09 3:36 am
回答 (2)
2011-06-09 5:27 am
✔ 最佳答案
都係果句: 先嘔左條式先!
concentration = mol/volume
呢度最易係volume 先啦
100 + 150 = 250 cm3
再係no of moles of Na+
1 個Na2CO3 有2個Na+
1mol 既Na2CO3 有2 mol Na+
Na2CO3 有2.5 * (100/1000) = 0.25 mol Na2CO3 mol
0.25 mol Na2CO3 有0.5 mol Na+
第2個solution:
no of moles of NaCl = 1 * (150/1000) = 0.15 mol
no of moles of Na+ in NaCl = 0.15 mol
所以總共有0.5 + 0.15 mol Na+
concentration = (0.5 + 0.15)/ (250/1000) = 2.6 mol dm-3
2011-06-09 8:19 pm
收錄日期: 2021-04-30 01:19:19
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