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"Bound" water as solvent water.

R Varga-Mányi

    Acta Biochimica Et Biophysica; Academiae Scientiarum Hungaricae
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Extraneous materials like urea and glucose can dissolve in "bound" water, challenging a common misconception in biological literature. This finding is based on experiments with saturated salt solutions.

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    Area of Science:

    • Chemistry
    • Biophysics

    Background:

    • A persistent misconception in biological literature suggests that "bound" water cannot dissolve extraneous materials.
    • This idea implies that water molecules tightly associated with ions or other structures are unavailable for solvation.

    Purpose of the Study:

    • To experimentally investigate the solvation capacity of "bound" water.
    • To challenge the prevailing misconception regarding the insolubility of certain substances in "bound" water.

    Main Methods:

    • Preparing saturated solutions of sodium chloride (NaCl) and potassium chloride (KCl).
    • Attempting to dissolve significant quantities of urea and glucose in these saturated salt solutions.
    • Analyzing the solvation behavior of urea and glucose in the presence of "bound" water.

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    Main Results:

    • Urea and glucose were successfully dissolved in saturated solutions of NaCl and KCl.
    • A portion of water forming the ionic hydration shells was identified as "bound" water.
    • This "bound" water demonstrated solvation capabilities for the tested solutes.

    Conclusions:

    • The misconception that "bound" water cannot dissolve extraneous materials is incorrect.
    • Water molecules within hydration envelopes (considered "bound") can indeed act as solvents.
    • Experimental evidence refutes the strict separation of "bound" and "free" water in terms of solvation capacity.