Question

osmosis is the diffusion of water from an area of high concentration to an area of low concentration. only water moves in osmosis! the diagrams below show the concentration of water and salt inside the cell and the concentration of water and salt surrounding the cell. complete the sentences below by comparing the concentration of the water inside the cell and the concentration outside the cell.
1.
95% nacl
5% h₂o
5% nacl
95% h₂o
a. water will flow _ (into the cell, out of the cell, in both directions).
b. the cell will _ (shrink, burst, stay the same).
2.
25% nacl
75% h₂o
80% nacl
20% h₂o
a. water will flow _ (into the cell, out of the cell, in both directions).
b. the cell will _ (shrink, burst, stay the same).
3.
35% nacl
65% h₂o
35% nacl
65% h₂o
a. water will flow _ (into the cell, out of the cell, in both directions).
b. the cell will _ (shrink, burst, stay the same).

Explanation:

• For 1a: Water moves from high to low concentration. Inside cell has 95% \(H_2O\), outside has 5% \(H_2O\). So water flows out of the cell.
• For 1b: When water flows out (cell loses water), it shrinks.
• For 2a: Inside cell has 20% \(H_2O\), outside has 75% \(H_2O\). Water moves into the cell (high \(H_2O\) outside to low \(H_2O\) inside).
• For 2b: As water enters (cell gains water), it bursts.
• For 3a: Inside and outside have same \(H_2O\) concentration (65%). So water flows in both directions (dynamic equilibrium).
• For 3b: Since water in - out balance (same concentration), cell stays the same.

Answer:

1.
a. out of the cell
b. shrink
2.
a. into the cell
b. burst
3.
a. in both directions
b. stay the same