my God!!! wat is the hope of our children tomorow?? wen nobody likes ligthing thier candles any more!! this is a full answer to a national exam question, tell me how can the youth concentrate on studying wen de kw that everything can be provided for them to copy from!!! ok see this for ur self and tell me wat u think.......... NECO 2013 PRACTICAL ANSWERS Titration Burette reading... 1st 2nd 3rd. final burette: 22.20,22.40, 22.30. Initial burette: 0.00, 0.20, 0.10. Volume of acid used: 22.20, 22.20,22.20. Average volume of acid use = 22.2+22.2+22.2/3=22.20cm^3 There fore 25cm^3 volume of pipette use gives 22.20cm^3 of acid = 22.20cm^3 Eqn of d rxn= 2HY + Na2co3->2NaY + H2O + CO2. Coc. Of B in g/dm3=5*.15*1000/ 250=20.0g/dm3 Conc of mol/dm3 of B= conc in g/dm3/ molar mass=20.0g/dm3/106g/ dm3=0.188mol/dm3 Conc of A in mol/dm3 .using CaVA/ cbvb=Na/Nb Ca*22.20/0.188*25=2/1 Ca=9.4/22.20 Ca=0.423mol/dm3 (2) Test..a. A point of c+water,stirred and fitered bi. A portion of the fitrate + naoh in drop and in excess. Test..a. A point of c+water,stirred and fitered bi. A portion of the fitrate +naoh in drop and in excess. Biii. Another portion of the filtrate + hcl +bacl Ci. Residue+ naoh in drop and in excess. ========OBSERVATION======= -A clear filtrate and a black residue were obtained
Posted on: Wed, 10 Jul 2013 06:09:09 +0000
Trending Topics
Recently Viewed Topics
© 2015