Chemistry, 25.02.2020 03:50 vuqepete4528
A particular sample of vinegar has a pH of 2.95. If acetic acid is the only acid that vinegar contains (Ka=1.8×10−5), calculate the concentration of acetic acid in the vinegar.
Answers: 3
![pH=-\log[H^+]](/tpl/images/0522/6990/cf945.png)
![2.95=-\log[H^+]](/tpl/images/0522/6990/b4bb5.png)
![[H^+]=1.122\times 10^{-3}M](/tpl/images/0522/6990/c196b.png)
for above equation follows:![K_a=\frac{[H^+][CH_3COO^-]}{[CH_3COOH]}](/tpl/images/0522/6990/2a1d5.png)
![[H^+]_{eq}=[CH_3COO^-]_{eq}=1.122\times 10^{-3}M](/tpl/images/0522/6990/95208.png)
![1.8\times 10^{-5}=\frac{(1.122\times 10^{-3})\times (1.122\times 10^{-3})}{[CH_3COOH]}](/tpl/images/0522/6990/a71f8.png)
![[CH_3COOH]_{eq}=0.0699M](/tpl/images/0522/6990/8c7a5.png)
![[CH_3COOH]_{eq}+[H^+]_{eq}=(0.0699+0.001122)=7.10\times 10^{-2}M](/tpl/images/0522/6990/444ef.png)
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A particular sample of vinegar has a pH of 2.95. If acetic acid is the only acid that vinegar contai...
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