What is the concentration of a solution of HCl in which a 10.0 mL sample of acid required 50.0 mL of 0.150 M NaOH solution for neutralization?

Answer 1

For this problem, we want to apply the formula MaVa=MbVb, meaning that the concentration of the acid multiplied by the volume of the acid should equal the concentration of the base multiplied by the volume of the base at the equivalence point. The equivalence point is defined as the point in the reaction when the moles of acid equals the moles of base.

First we write out the equation

MaVa=MbVb

Next we plug in what we know, making sure to convert the volumes initially given in millimeters to liters by dividing by 1000.

Ma (0.010 L) = (0.150 M)(0.050 L)

Then, we solve for Ma, the concentration of the acid

Ma = 0.75 M

The concentration of acid required for neutralization is 0.75 M.

Answer 2