25.0cm3 of s saturated potassium hydroxide is neutralized by 35.0cm3 of hydrogen chloride acid of concentration 0.75 mol/dm3. Calculate the concentration of potassium hydroxide solution. Please help, will give brainliest, unhelpful answers will get reported.

Concentration of the original solution: approximately .

Explanation:

Notice that the concentration of the solution is in the unit . However, the unit of the two volumes is . Convert the unit of the two volumes to to match the unit of concentration.

.

.

Calculate the number of moles of molecules in that of solution:

.

is a monoprotic acid. In other words, each would release up to one proton .

On the other hand, is a monoprotic base. Each formula unit would react with up to one .

Hence, molecules and formula units would react at a one-to-one ratio.

.

Therefore, that of molecules would neutralize exactly the same number of formula units. That is: .

Calculate the concentration of a solution where and :

.

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: