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Suggest a way to determine wedge(m^(@)) ...

Suggest a way to determine `wedge_(m^(@))` value of water.

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`Lambda_(m (H_(2)O))^(@) = lambda_(m (H^+))^(@) + lambda_((OH^(-))^(@)`
We determine `Lambda_(m (HCl))^(@) , Lambda_(m (NaOH))^(@) - Lambda_(m (NaCl))^(@)` . Then
`Lambda_(m (H_(2)O))^(@) = Lambda(m (HCl))^(@) + Lambda_(m (NaOH))^(@) - Lambda_(m(NaCl))^(@)`
`= lambda_(m (H^(+)))^(@) + lambda_(m (Cl^(-)))^(@) + lambda_(m (Na^(+)))^(@) + lambda_(m (OH)^(-))^(@) - lambda_(m (Na^(+)))^(@) - lambda_(m (Cl^(-)))^(@)`
`= lambda_(m (H^(+)))^(@) + lambda_(m (OH^(-)))^(@)`
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