find the basicity

用戶170729

2008-04-13 3:10 am

no. of mole of NAOH : 0.033
no.of mole of tartaric acid : 0.0167

find the basicity of tartaric acid = 2

點解係2? 我知係NAOH 除 acid
但係點解唔係acid 除NAOH??

更新1:

唔好意思都係唔係幾明

回答 (1)

Uncle Michael

2008-04-13 5:21 am

✔ 最佳答案

Assume that the basicity of tartaric acid is n.
Hence, the molecular formula of tartaric acid can be written as HnA.

HnA + nNaOH → NanA + nH2O
Mole ratio HnA : NaOH = 1 : n
(No. of moles of HnA) : (No. of moles of NaOH) = 1 : n
(No. of moles of HnA) / (No. of moles of NaOH) = 1 / n
Hence n = (No. of moles of NaOH) / (No. of moles of HnA)

2008-04-12 21:23:34 補充：
Explanation of the equation :
If n = 1, HA + NaOH → NaA + H2O
If n = 2, H2A + 2NaOH → Na2A + 2H2O
If n = 3, H3A + 3NaOH → Na3A + 3H2O
etc.

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