10 ml of a 2.5m hcl solution was added to 500ml of 0.20m hno3 solution. what was the concentration of h ions in the final solution

The concentration of H+ ions can be calculated by adding the number of H+ ions from each substance given above. We calculate as follows:

2.5 M HCl ( .01 L ) = 0.25 mol HCl = 0.25 mol H+

0.20 M HNO3 (.50 L ) = 0.1 mol HNO3 = 0.1 mol H+

Therefore,

Concentration of H+ = (0.25 + 0.1) / (.01 +.5) = 0.7 M

Hope this answers the question. Have a nice day.

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

  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-