Biology 6-12
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Apr 20, 2015
Advice please!
When carrying out an experiment measuring the time taken for diffusion of HCl to occur through an agar block (made of agar, NaOH and cresol red indicator) - What trend are we hoping to see if I use different concentrations of acid : 0.2, 0.4, 0.6 0.8 and 1.0 M
Would really appreciate a fast response!
Thanks
Deborah
My guess for your experiment is that there will be a greater volume of the agar block that becomes neutralised with the higher concentration of acid. I am thinking that the cube should change from pink to yellow as the HCl reacts with the NaOH. Given enough time for full diffusion then at lower concentrations there may not be enough HCl left to neu...See More
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