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How is formic acid prepared ?...

How is formic acid prepared ? 

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a) Formic acid is prepared by the oxidation of methyl alcohol.
`CH_3OHunderset(H_2SO_4)overset(K_2Cr_2O_7)(rarr)HCHOunderset(H_2SO_4)overset(K_2Cr_2O_7)(rarr)HCOOH`
b) It is also prepared by heating a mixture of carbon monoxide and sodium hydroxide at `210^@C` under pressure
`CO+NaOH to HCOONa overset(HCl)(rarr)HCOOH`.
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