I'm having trouble with chemistry practicals, can anyone help me? Anyone with the same problem?

Question

It's with both the quantitative analysis (with titrations and stuff like that) and qualitative analysis (finding out what a certain given chemical is by doing the tests on the question paper).

I hardly ever get the right amount of stuff in the titrations and my qualitative analysis is even worse. An utter mess. I get this weird precipitate when it's not supposed to be there and the colours are really odd. The last time I did one, my precipitate was this unameable dark brownish (?) colour.

Desperately seeking a little help. What's going wrong?! (Even the teacher is mystified when I ask.)

Answer 1

Chemical reactions usually require the combination of one type of atom to another (or atoms added to molecules). The (nearly) exact number of atoms required should be added so that there are few if any left over (of either type). Experiments should be followed in detail, especially determining and weighing the correct amount of chemicals needed for a complete reaction. Sometimes the weight in grams on a scale must be compensated for the buoyancy of air! Also, (in titration?) it may be necessary to add one chemical to another in small steps to observe for a change in color without exceeding the amount required. The chemical formulas can often indicate the gram weights of reactants needed for a particular complete reaction. After that it is the experience and fine touch of the experimenter. A careless cook throws in too much salt or spice, right? Good luck.

Answer 2

No,I comprehend. you could finally end up dropping time through posting questions about a somewhat esoteric challenge and getting extremely some lame responses. He probable needs the contacts so as that once he sees an advantageous question he can flow it interior a extra rarefied component,or someone in his contacts would do an identical for him. those with somewhat somewhat professional interests try this each and each one the time. i do not often get smart responses except from contacts that I have chosen. you're being somewhat paranoid,methinks.

Answer 3

Always use pure water for any use. I was having the same problem. My teacher advised me to get Rain water for all the students. For that, I used to store rain water (when it is raining) in a pure vessels and use it in our class for all my classmates. By this we can minimize the errors.

Always use fresh chemicals which also minimizes the errors and obviously you should do by proper procedure.

In Titration, use rain water for diluting the acids and add correct proportion of water. That will minimize the errors and also note the reading very carefully.

Best of luck.

Answer 4

are you sure you're following the instructions correctly? it is normal to have a bit different result than the expected one, since you're new to analysis but can't be totally different