Answer:
2.5M
Step-by-step explanation:
We begin by writing a balanced equation for the reaction. This is shown below:
HCl + NaOH —> NaCl + H2O
From the equation above we obtained the following:
nA (mole of the acid) = 1
nB (mole of the base) = 1
Data obtained from the question include:
Vb (volume of the base) = 12.5mL
Mb (Molarity of the base) = 2M
Va (volume of the acid) = 10mL
Ma (Molarity of the acid) =?
The molarity of the acid can be calculated as follow:
MaVa/MbVb = nA/nB
Ma x 10 / 2 x 12.5 = 1
Cross multiply to express in linear form as shown below:
Ma x 10 = 2 x 12.5
Divide both side by 10
Ma = (2 x 12.5) /10
Ma = 2.5M
The molarity of the acid is 2.5M