Why Do Potato Prisms Decline
The results provide evidence that when there was an increase in the sodium chloride concentration the mass of the potato prisms declined. At the zero percent concentration there was an increase of mass by 1.75%, from there the 1%, 3%, 5% and 10% begun on a downward trend with the percentage change in mass declining. The graph was on a steady decline from 0% being the highest point with a change of mass of 1.75% finishing with the 10% solution on a decline of -12.28%. From observing the scatter plot the data points were not far from the line of best fit, indicating the results were hardly affected by random errors. Resulting in fairly precise and reliable results.
The hypothesis stated ‘As the concentration of sodium chloride increases the mass of the potato in the solution will decrease.’ This was supported as with the increase of sodium chloride concentration the change in mass was on a steady decline with each percentage of sodium chloride losing greater amounts of mass. The 0% was the only solution to have an increase of mass where as the other percentages steadily declined with the increase of concentration. …show more content…
They need to be kept the same throughout the practical in order to test the relationship between the dependent and independent variables. If they are not kept constant the results will be unreliable as each test performed will use a different mass of potato, the time spent in the solution will be inconsistent and the amount of solution in the beaker would vary. Keeping the variables constant is an important factor as the concentration of the sodium chloride solution should be the only factor influencing the percentage change in mass when comparing the different samples
The hypothesis stated ‘As the concentration of sodium chloride increases the mass of the potato in the solution will decrease.’ This was supported as with the increase of sodium chloride concentration the change in mass was on a steady decline with each percentage of sodium chloride losing greater amounts of mass. The 0% was the only solution to have an increase of mass where as the other percentages steadily declined with the increase of concentration. …show more content…
They need to be kept the same throughout the practical in order to test the relationship between the dependent and independent variables. If they are not kept constant the results will be unreliable as each test performed will use a different mass of potato, the time spent in the solution will be inconsistent and the amount of solution in the beaker would vary. Keeping the variables constant is an important factor as the concentration of the sodium chloride solution should be the only factor influencing the percentage change in mass when comparing the different samples