If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Mechanisms of transport: tonicity and osmoregulation

AP.BIO: ENE‑2 (EU), ENE‑2.H (LO), ENE‑2.H.1 (EK), ENE‑2.I (LO), ENE‑2.I.1 (EK), ENE‑2.I.2 (EK), ENE‑2.J (LO), ENE‑2.J.1 (EK)
You might need: Calculator

Problem

A group of biology students weighed several potato cubes and placed them in open beakers containing various sucrose solutions at 30, degrees, start text, C, end text. The following day, the students weighed the potato cubes again and calculated the differences in mass.
It was determined that solute potential equilibrium was reached at 0, point, 35, start text, M, end text.
Solute potential of a solution: \psi, start subscript, s, end subscript, equals, minus, i, C, R, T
  • i, equals ionization constant (1, point, 0 for sucrose)
  • C, equals molar concentration
  • R, equals pressure constant (0, point, 0831, start text, L, end text, dot, start text, b, a, r, end text, dot, start text, m, o, l, end text, start superscript, minus, 1, end superscript, dot, start text, K, end text, start superscript, minus, 1, end superscript)
  • T, equals temperature in Kelvin (degrees, start text, C, end text of solution plus, 273)
What is the solute potential of the potato cubes?
Choose 1 answer:
Choose 1 answer:
Stuck?
Stuck?