@@MaChemGuy But what if you were doing the sulfate test followed by the halide test in the same test tube? Wouldn''t you need to use barium nitrate solution instead of barium chloride solution to prevent adding choride ions to the solution?
trihardFTW Completion of the PAG's is not a requirement of AS so technically you can do all 12 in second year. However, exam questions will feature practical skills. I did 1-6 with my y12 students last year
@@shivparekh1021 use universal indicator paper (turns red) or blue litmus paper (turns red) to identify the nitric acid. Then add the nitric acid to each of the test tubes, followed by a halide containing molecule. The test tube producing the ppt will identify the nitric acid and also the halide present (by the colour of the ppt). I think this is alright, not 100% tho.
Are those equations all for part 1?
When you add barium chloride does that not add more chlorides into the mix that could react with the silver?
wrongemboyo 79 You just need a source of aqueous Ba2+ ions. Barium chloride/nitrate are the common reagents.
@@MaChemGuy But what if you were doing the sulfate test followed by the halide test in the same test tube? Wouldn''t you need to use barium nitrate solution instead of barium chloride solution to prevent adding choride ions to the solution?
@@Rose87 You'd use barium nitrate in that case. Just need a source of Ba2+ ions
Hello! I just wanted to ask, is there a chance that any of these practicals can come up on ANY paper or are some paper specific?
GOODLUCK!!
How many PAGs are there for AS?
trihardFTW There are 12 altogether so most schools/colleges would do 6 in Y12
so are 6 needed to be known for the AS exams this year, or all 12?
trihardFTW Completion of the PAG's is not a requirement of AS so technically you can do all 12 in second year. However, exam questions will feature practical skills. I did 1-6 with my y12 students last year
thanks!
how do you identify the nitric acid though
In general? Wasn't one of the substances being tested
this was my question, the OCR sheet says we have to identify HNO3? Also says to identify AGNO3?
@@shivparekh1021 Did you use litmus paper? turns blue into red??
@@shivparekh1021 use universal indicator paper (turns red) or blue litmus paper (turns red) to identify the nitric acid. Then add the nitric acid to each of the test tubes, followed by a halide containing molecule. The test tube producing the ppt will identify the nitric acid and also the halide present (by the colour of the ppt). I think this is alright, not 100% tho.