SCIENTIFIC INQUIRY • INTERPRET THE DATA A Minnesotagardener notes that the plants immediately bordering a walkwayare stunted compared with those farther away. Suspectingthat the soil near the walkway may be contaminated from saltadded to the walkway in winter, the gardener tests the soil. Thecomposition of the soil near the walkway is identical to thatfarther away except that it contains an additional 50 mM NaCl.Assuming that the NaCl is completely ionized, calculate howmuch it will lower the solute potential of the soil at 20°C usingthe solute potential equation:ΨS = -iCRTwhere i is the ionization constant (2 for NaCl), C is themolar concentration (in mol/L), R is the pressure constant[R = 0.00831 (L · MPa)/(mol · K)], and T is the temperature inKelvin (273 + °C).How would this change in the solute potential of the soilaffect the water potential of the soil? In what way would thechange in the water potential of the soil affect the movementof water in or out of the roots?
SCIENTIFIC INQUIRY • INTERPRET THE DATA A Minnesota
gardener notes that the plants immediately bordering a walkway
are stunted compared with those farther away. Suspecting
that the soil near the walkway may be contaminated from salt
added to the walkway in winter, the gardener tests the soil. The
composition of the soil near the walkway is identical to that
farther away except that it contains an additional 50 mM NaCl.
Assuming that the NaCl is completely ionized, calculate how
much it will lower the solute potential of the soil at 20°C using
the solute potential equation:
ΨS = -iCRT
where i is the ionization constant (2 for NaCl), C is the
molar concentration (in mol/L), R is the pressure constant
[R = 0.00831 (L · MPa)/(mol · K)], and T is the temperature in
Kelvin (273 + °C).
How would this change in the solute potential of the soil
affect the water potential of the soil? In what way would the
change in the water potential of the soil affect the movement
of water in or out of the roots?
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