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What should i choose between two research questions for Bio ia?

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Hi, Im doing standard level Biology. I have two different research questions for my IA. 

Could you guys choose which one is better to get higher grade?

1. To what extent the concentration of antacid affect the pH of different concentration of hydrochloric acid (1.5 to 3.5)? what would be the final value of pH of of all neutralised solution?

2. How far does the concentration of starch solution and a fixed volume of iodine solution affect the absorbance at 'orange' wavelength (610 nm)

 

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