急問 化學題目 關於溶液
Crtric acid , which can be obtained from lemon juice , has the molecular
formula C6H8O7. A 0.250-g sample of citric acid dissolved in 25.0mL
of water requires 37.2 mL of 0.105 M NaOH for complete neutralization.
What number of acidic hydrogens per molecule does citric acid have?
Answer : Citric acid has three acidic hydrogens per citric acid molecule
請幫忙解這題 解釋題目 外加過程 感恩
- Anonymous1 decade agoFavorite Answer
First of all, molar mass of citric acid is:
6 × 12 + 8 × 1 + 7 × 16 = 192 g/mol
Then, no. of moles of citric acid used = 0.25/192 = 0.00130
Also, no. of moles of NaOH used = 0.105 × 37.2/1000 = 0.00390
Hence, mole ratio of citric : NaOH = 1 : 3
Therefore, number of acidic hydrogns per molecule that citric acid has is 3.Source(s): My chemical knowledge