<Tr> <Td> below pH 3.1 </Td> <Td> </Td> <Td> above pH 4.4 </Td> </Tr> <Tr> <Td> 3.1 </Td> <Td> ⇌ </Td> <Td> 4.4 </Td> </Tr> <P> In an acid, it is reddish and in alkali, it is yellow . Methyl orange has a pK of 3.47 in water at 25 ° C (77 ° F). </P> <Table> <Tr> <Td_colspan="3"> Methyl orange in xylene cyanol solution (pH indicator) </Td> </Tr> <Tr> <Td> below pH 3.2 </Td> <Td> </Td> <Td> above pH 4.2 </Td> </Tr> <Tr> <Td> 3.2 </Td> <Td> ⇌ </Td> <Td> 4.2 </Td> </Tr> </Table>

Methyl orange is an indicator with a ka of
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