What is the concentration of hydrochloric acid solution if 6.68 ml is neutralised by 13.90 ml of 0.0161 M potassium hydroxide solution ?
The molarity of the hydrochloric acid solution was 0.0335 M.
You're dealing with a neutralization reaction in which hydrochloric acid, a strong acid, reacts with potassium hydroxide, a strong base, to produce potassium chloride, a salt, and water.
The balanced chemical equation looks like this
The important thing to notice here is that you have a
This means that your hydrochloric acid solution contained
Now use the volume of the hydrochloric solution and the number of moles of
The answer is rounded to three sig figs, the number of sig figs you gave for the molarity of the potassium hydroxide solution.
The concentration of HCl =
So no. moles KOH =
From the equation we can see that they react in a molar ratio of 1:1.
This means that the no. moles HCl must be the same: