well, some time ago my classmates and I did an experiment with raw-brine where the question was to find how much of Ca++ and Mg++ there were in this rawbrine.
we took 2 times 0.01 L of this rawbrine and put it in two glasses. In one we mixed it with a NH4 buffer and in the other we used a NaOH solution.
We mixed this again with echrom-T and carbon and then the color changes. Then we kept filling the two glasses with EDTA to find out how much Ca and Mg there was. But now comes the question. I had one with 28,5 ml and one with 30,5 ml but I cant find which one had buffer and NaOH.
So when you use buffer do you find the complete amount of Mg or Ca or do you do it with NaOH. which one should get most EDTA before turning color meaning it has both?
we took 2 times 0.01 L of this rawbrine and put it in two glasses. In one we mixed it with a NH4 buffer and in the other we used a NaOH solution.
We mixed this again with echrom-T and carbon and then the color changes. Then we kept filling the two glasses with EDTA to find out how much Ca and Mg there was. But now comes the question. I had one with 28,5 ml and one with 30,5 ml but I cant find which one had buffer and NaOH.
So when you use buffer do you find the complete amount of Mg or Ca or do you do it with NaOH. which one should get most EDTA before turning color meaning it has both?
Last edited by stef10 (2008-02-23 05:59:27)
