Gdevon’s laboratory is out of material to make phosphate buffer. he is considering using sulfate to make a buffer instead. the pkapka values for the two hydrogens in h2so4h2so4 are −10−10 and 2.2. will this approach work for making a buffer effective near a ph of 7? 7?

Due to operator log it is impossible to reach a pH of 7 with these pKa's or acids used.

Explanation:

Since the pKa values provided are not near to 7, reaching a neutral pH is not possible because of the governing equation equation of Buffer:

where x is\frac{HA}{A}

So the ratio of HA and A is vastly big so then it is almost impossible to arrive to this number.

  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-

it is b that is the answer.