If 20 g NaOH and 36.5 g HCl are added in 360g water then % by wei ght HCl ?

1 Answer
Nam D.
Jun 24, 2018

I get approximately #8.76%#.

Explanation:

First we have to find the total mass of the new solution.

#m_"solution"=360 \ "g" \ H_2O+20 \ "g" \ NaOH+36.5 \ "g" \ HCl#

#=416.5 \ "g total"#

Then, we divide the mass of hydrochloric acid by the mass of the new solution and multiply by #100%#.

#% \ "weight" \ HCl=(36.5color(red)cancelcolor(black)"g")/(416.5color(red)cancelcolor(black)"g")*100%~~8.76%#

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