# How Salty is a Potato- A lab report

Essay by 1337n008 November 2006

Aim: My aim is to find the salt concentration in an average potato and I will do it by investigating the interaction of osmosis between the potato and glasses of water with different concentrations of salt.

Equipment

1 measuring cylinder

10 boiling tubes

10 bungs

Plan

Firstly, pour ten equal amounts of the salt solution into the ten boiling tubes so that in the end each boiling tube will contain 50mm of the 10% salt solution. After that, I will change 9 of the 10% salt solutions into 9%, 8%, 7%, 5%, 3%, 1%, 0.5%, and 0.01% solutions. To change 50mm of 10% salt solution into a 7% salt solution, I pour (5 x (10-7)) mm of salt solution out and then I add (5 x (10-7)) mm of distilled water into the current solution. To change 50mm of 10% salt solution into an 0.5% salt solution, I pour (5 x (10-0.5))

mm of salt solution out and then I add (5 x (10-0.5)) mm of distilled water into the current solution. So if n is the percentage of the salt I am trying to turn the 10% salt solution into (where is an integer and smaller than 10), then I pour (5 x (10-n)) mm of salt solution out and I add (5 x (10-n)) mm of distilled water into the solution afterwards.

Secondly, After I have finished with the pouring, I add a bung on each of the ten boiling tubes with the solutions inside and I shake hard so the salt will be more equally distributed among the solution.

Thirdly, After I have a 10%, 9%, 8%, 7%, 5%, 3%, 2%, 1%, 0.5%, and 0.1% salt solution, I cut out 10 equally sized strips of potatoes. I will pour a bit of each density out so there...