Experimental solubility data of sodium naphthalene-1,5-disulfonate
in five neat solvents (water, methanol, ethanol, 2-propanol, acetone)
and three binary solvent systems (water + ethanol, water + 2-propanol,
water + acetone) at different temperatures from 283.15 to 323.15 K
were determined by the gravimetric method. The experimental results
showed that three kinds of polymorphs appeared in the investigated
solvent systems, and the solubility of sodium naphthalene-1,5-disulfonate
all increased with increasing temperature and water content. According
to the data measured, water was suitable to be the positive solvent,
while methanol was considered to be a less-effective antisolvent due
to its relatively large dissolving capacity. By means of our research,
the solubility of sodium naphthalene-1,5-disulfonate in the neat solvents
had a relation with the polarity of the solvents. The solubilities
of sodium naphthalene-1,5-disulfonate were fitted by the modified
Apelblat, Jouyban-Acree, van’t Hoff-Jouyban-Acree, and Apelblat-Jouyban-Acree
models. The results showed that the four models can predict the experimental
values very well.
The
solubility of l-alanine in five binary systems water
+ methanol, water + ethanol, water + 1-propanol, water + 2-propanol,
and water + acetone and 12 neat solvents (water, 1-butanol, methanol,
2-butanol, 2-methyl-1-propanol, 1-pentanol, 1-propanol, ethanol, 2-propanol,
ethyl acetate, acetonitrile, and acetone) was determined by the gravimetrical
method within the temperature range from 283.15 to 323.15 K under
atmospheric pressure. The experimental results indicated that the
solubility increased with increasing temperature and mole ratio of
water in all investigated solvents and decreased with the rise of
the mole fraction of five different organic solvents in the binary
solvent systems. The order of l-alanine solubility in the
selected pure solvents was water > 1-butanol > methanol ≈
2-butanol
> 2-methyl-1-propanol ≈ 1-pentanol ≈ 1-propanol ≈
ethanol > 2-propanol > ethyl acetate > acetonitrile >
acetone. The
solubility was mathematically represented by the modified Apelblat,
Jouyban–Acree, and Apelblat–Jouyban–Acree models.
All the models can be found to agree well with the data in the experiment.
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