Abstract
Partial volumes \(\bar V^0\) of amino acids in aqueous NH4Cl and NaCl solutions are discussed. The salts have different effects on water structure. The contributions of the charged NH3+ and COO− groups of amino acids are found. Structural characteristics of hydrated complexes are calculated: partial volumes of water inside and outside the hydration sphere and hydration numbers. The same value of \(\bar V^0\) (NH3+, COO−) is achieved at a higher NH4Cl concentration. The two salt systems with the same \(\bar V^0\) (NH3+, COO−) have similar values of the partial volumes of water and hydration numbers.
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