Osmosis Lab

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Last updated 5 years ago

Discipline:
Science
Subject:
Biology
10

Osmosis Lab

Variables of LabIndependent: The molarity of the Sucrose that was put in dialysis tubing. Dependent: The mass change of tubing.

ConclusionIn this lab we wanted to know the relationship between the solute concentration and the movement of water. As a class, we found that the higher the Molarity ( in this case Sucrose) the higher the percent change of mass is created. There was increase of mass and it gets bigger as the Molarity or concentration gets higher. This result occurred because the water went from the beaker to inside the dialysis tubing because there's a higher concentration of solute in the tubing, so the water goes from an area of low concentration of sulute (hypnotonic)to a high concentration (hypertonic). This occurs because the beaker and the tubing want to reach equlilibrium. One error that occurred in this lab is when you have to rinse off water from the outside of the dialysis tubing. Water could've sticked on or entered the sucrose solution which adds to the mass of the tubing. We could fix this by simply being careful when we pour the sucrose in, and we would have to open the tubing when it's dry. Another, error is the tying of both ends of the tubing with the string. Not only does it masss to the tubing, but every groupd could've tied it differently, using just one knot or two which adds different masses.We could fix this by clipping all of the tubing with a binder clip (has a uniform mass) or we could all have a specific way of tying the tubing.

Follow Up Questions1. We calculate percent change instead of mass change because it's more sccurate to see the increased mass in ratio to the inital mass rather than just seeing the amount gained. 2.Distilled Water % Change: (20f -18g)/ 20g = -2g/ 20g =-0.1%3. The water would flow from inside the dialysis tubing to the outside solution in the beaker.