<Dd> CO 2 + H 2 O ↽ − − ⇀ HCO 3 − + H + (\ displaystyle (\ ce ((CO2) + (H2O) <=> (HCO3 ^ (-)) + (H+)))) </Dd> <P> The United States Department of Agriculture Natural Resources Conservation Service, formerly Soil Conservation Service classifies soil pH ranges as follows: </P> <Table> <Tr> <Th> Denomination </Th> <Th> pH range </Th> </Tr> <Tr> <Td> Ultra acidic </Td> <Td> <3.5 </Td> </Tr> <Tr> <Td> Extremely acidic </Td> <Td> 3.5--4.4 </Td> </Tr> <Tr> <Td> Very strongly acidic </Td> <Td> 4.5--5.0 </Td> </Tr> <Tr> <Td> Strongly acidic </Td> <Td> 5.1--5.5 </Td> </Tr> <Tr> <Td> Moderately acidic </Td> <Td> 5.6--6.0 </Td> </Tr> <Tr> <Td> Slightly acidic </Td> <Td> 6.1--6.5 </Td> </Tr> <Tr> <Td> Neutral </Td> <Td> 6.6--7.3 </Td> </Tr> <Tr> <Td> Slightly alkaline </Td> <Td> 7.4--7.8 </Td> </Tr> <Tr> <Td> Moderately alkaline </Td> <Td> 7.9--8.4 </Td> </Tr> <Tr> <Td> Strongly alkaline </Td> <Td> 8.5--9.0 </Td> </Tr> <Tr> <Td> Very strongly alkaline </Td> <Td>> 9.0 </Td> </Tr> </Table> <Tr> <Th> Denomination </Th> <Th> pH range </Th> </Tr>

Where are acids found on the ph scale
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