Chemistry: Calculation involving Weighing Out Substance?
2011-08-01 3:21 am
A solution requires 250 ml of a 7.5 % (w/v) solution of tri sodium citrate. The only citrate you have available is the dihydrate, C6H5O7Na3.2H2O with a formula weight of 294.1. How much would you have to weigh out to make up this solution?
回答 (1)
2011-08-01 4:09 am
✔ 最佳答案
(0.250 L) x (0.075) = 0.01875 g dry sodium citrateformula weight of C6H5O7Na3 = 258.0697 g/mol
(0.01875 g) x (294.1 / 258.0697) = 21.4 mg
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