Consider the following indicators and their pH ranges: Methyl orange 3.2-4.4
Methyl red 4.8-6.0
Bromothymol blue 6.0-7.6
Phenolphthalein 8.2-10.0
Alizarin yellow 10.1-12.0
Assume an indicator works best when the equivalence point of a titration comes in the middle of the indicator range. For which of the following titrations would methyl red be the best indicator?
a) 0.100M HNO3+0.100M KOH.
b) 0.100M aniline(Kb=3.8×10^-10)+0.100M HCl.
c) 0.100M NH3(Kb=1.8×10^-5)+0.100M HCl.
d) 0.100M HF(Ka=7.2×10^-4)+0.100M NaOH.
e) 0.100M acetic acid(Ka=1.8×10^-5)+0.100M NaOH.

no lo se javvs jshva vía yha jsuh snkaic

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

може ли да зареждате повече информация, моля