IA BIO HL plants

[sedude248]

Hey all,

I am in desperate need of help. I completely messed up my experiment on aquatic plant growth, and if I don't do it properly I won't pass DP1. I am investigating the affect of pH on aquatic plant growth. To variate the pH, my technician prepared citric acid pH buffers of 4,5,6,7,8. I used those to get the pH I wanted, but this is where it goes wrong. I said I would have 40ml of water, and add 10 ml of the buffer to get the pH I want. But I noticed that when at 5 ml of buffer 5 (to get pH 5) I'd need much more (obviously). So instead I just added 5 ml of pH 4 buffer, not understanding my mistake. My teacher pointed out this mistake, and told me to change my method because this cannot make any sense. What do I do!! I have my data collection due this Friday! Should I just do a completely different experiment?

thanks!