This piece of investigative work aims to prove, through two different experiments: 1. the water potential of potato tuber cells by the weighing method, and 2. the estimation of glucose in a solution using the colorimetric method.

... AS Biology Matthew Cox cox04067214 Introduction This piece of investigative work aims to prove, through two different experiments: 1. the water potential of potato tuber cells by the weighing method, and 2. the estimation of glucose in a solution using the colorimetric method. In the first experiment, samples of potato, extracted from the same potato using a cork borer, will be weighed prior to the experiment and then weighed again at the end. The aim is to find the water potential of each sample by calculating the percentage increase or decrease in mass and therefore to find which solution is closest to the potato tuber's natural solute potential. The change can be accounted for by the amount of water taken in by each sample. In the second experiment, 10 samples will be tested in order to find how long it takes for an acidified glucose solution, coloured purple by potassium manganate (VII), to clear. The 10 samples were

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