Chem(Help)
2008-05-03 10:02 pm
1. Orange juice contains citric acid. The relative molecular mass of citric acid is 192. In a sample of orange juice, the concentration of citric acid is 8.06g dm-3 . 25.0 cm3 of the sample require 7.50 cm3 of 0.420M sodium hydroxide solution for complete neutralization. Determine the basicity of citric acid.
回答 (1)
2008-05-03 10:56 pm
✔ 最佳答案
no. of mole of NaOH reacted = 0.42 x 7.5/1000 = 0.00315no. of mole of citric acid reacted = 8.06/192 x 25/1000 = 0.00105
mole ratio of NaOH to citric acid = 0.00315 / 0.00105 = 3 / 1
Ans: Basicity of citric acid is 3.
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