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# Investigate how PH affects the ability of raw meat to absorb water - Plan

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Introduction

Tenderising Meat I am planning an experiment to investigate how PH affects the ability of raw meat to absorb water. * Independent Variable The independent variable for this experiment is the PH of the solution the steak is marinated in. I will achieve a range of different PH values by using buffers set at PH 1, 3, 5, 7, 9. I predict that there will be an optimum PH where the steak will absorb the most water. The amount of water absorbed by the raw meat will increase as you increase the PH up to the optimum and then decrease the PH as the PH increases past the optimum. * Dependent Variable The dependent variable for this experiment is the amount of water absorbed by the diced steak by process of osmosis. ...read more.

Middle

This could alter the end percentage change in mass. The mass of the diced steak before marination needs to be controlled. A larger mass could potentially absorb and store more water. I will try to get as similar masses as possible to avoid any differences in weight. Instead of calculating the difference in mass, I will calculate percentage change in mass to account for any small differences in mass. Also a constant surface area of the diced steak is important, otherwise there would be a larger area for the solution to act on causing more tenderisation therefore altering the overall results. The temperature at which the meat is marinated at would need to remain constant. At a higher temperature, molecules are moving faster therefore osmosis is more likely to occur. ...read more.

Conclusion

Drying of the steak pieces, dab twice on each side. If some are dabbed more than the other it would alter the end percentage change in mass. * Method ? Divide the diced steak into five equally sized piles. ? Using electronic scales weigh each pile to make the masses as similar as possible. Record the masses. ? Add 50ml of buffer solution PH1 to a beaker and repeat the process for the other buffer solutions. ? Put one set of diced steak into each beaker. ? Leave the 5 beakers for 12hours allowing the raw meat to marinate. ? Remove the dices from the solution and pat dry before weighing. ? Record the mass of each pile and calculate the percentage change in mass by using formula : Change x 100 Original ? Repeat the experiment 3 times to ensure an accurate set of results. ? Plot a graph of PH against percentage change in mass. Stephanie Mckeown ...read more.

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