Answer:
Concentration of unreacted hydroxide ions in the final solution is 0.02 mol/L.
Explanation:
Moles of HCl
=
1 mole of HCl give = 1 mole of
Thus 0.01875 moles of HCl give = 0.01875 mole of
Moles of :
According to stoichiometry:
1 mole of Ba(OH)_2 gives = 2 moles of :
Thus 0.012 moles of give = 2 \times 0.012375 =0.02475 moles of
According to neutralization reaction, 1 mole of neutralizes 1 mol .
0.01875 mol of will neutralize 0.01875 mol .
Moles of hydroxide ion left unreacted :
= 0.02475 mol - 0.01875 mol = 0.006 mol
Concentration of unreacted hydroxide ions in the final solution: