A series of dilute NaCl solutions are prepared starting with an initial stock solution of 0.100 M NaCl.?
2014-02-23 5:38 am
Solution A is prepared by pipeting 10 mL of the stock solution into a 250-mL volumetric flask and diluting to volume. Solution B is prepared by pipeting 25 mL of solution A into a 100-mL volumetric flask and diluting to volume. Solution C is prepared by pipeting 20 mL of solution B into a 500-mL volumetric flask and diluting to volume. What is the molar concentration of NaCl in solutions A, B and C?
回答 (1)
2014-02-23 10:16 pm
✔ 最佳答案
A = (0.100 M) × (10 mL) / (250 mL) = 0.0040 MB = (0.0040 M) × (25 mL) / (100 mL) = 0.0010 M
C = (0.0010 M) × (20 mL) / (500 mL) = 4.0 × 10-5 M
收錄日期: 2021-04-13 20:09:54
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140222213837AAUuEEb