<Table> <Tr> <Td> </Td> <Td> </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th_colspan="2"> Names </Th> </Tr> <Tr> <Td_colspan="2"> IUPAC name Ammonium </Td> </Tr>

What is the concentration of the ammonium cation