Hi there, a few weeks ago I did a chemistry experiment on back titration. However, I misplaced the worksheet given to me with questions on the practical work we did, hence left it til the last minute. Now I've found it and I'm having trouble with some of the questions. On top of that my chemistry teacher says he will fail me if I don't hand this by next lesson. Below are the intructions to the experiment that we did and the relevant questions given. I think it's a pretty common experiment so many people here would probably be familiar with it (or have done a similar experiment). If anyone could help me out just this once that would be appreciated. And I'm not asking for solutions here but just a few hints for each of the questions below. I'll ask questions accordingly and make my own deductions on how to answer the questions. I am also interested to know this experiment for why each step must be carried out as I've been told that I will be doing it again next year. So, if anyone knows of any sites they could direct me that would be helpful.