Question

1. for which of the five solutions with different concentrations of glucose were your potato isotonic? which were hypertonic and which were hypertonic?

2. would increasing the temperature of the glucose solutions that you usd by 5c hsvr cuased your concusions to be different?

3. an intravenous adminstration of 5% gluscose (destrose is commanly used as a maintance fluid for patients unable to drink water. Do you execpt that solution to be hypotonic relative to red blood cell

Answer 1

1) In 0.4M solution, the potato doesn't take or lose any water. So, this solution is isotonic. The 0.2M solution is hypotonic. The 0.6M, 0.8M, and 1.0M solutions are hypertonic.

2) The effect of concentration of glucose and temperature can change the rate of osmosis. The rate of osmosis increased as concentration of glucose increased, and varied at different temperatures. Increasing the temperature can cause molecules to have more energy and move faster, therefore increasing the rate of osmosis. So, increasing the temperature of the glucose solutions used by 5c hsvr caused our conclusions to be different.

3) 5% glucose solution is not hypotonic relative to red blood cell. This is isotonic to the red blood cell.