Question #19f01

1 Answer
Nathan L.
Jul 19, 2017

#%"mass NaOH" = 32%#

Explanation:

I'll assume the percentage concentrations are those by mass.

We know:

  • there are #8.6# #"kg"# of water

  • there are #3.4# #"kg"# of caustic soda

Since the caustic soda is #92.7%# #"NaOH"# by mass, the mass of #"NaOH"# in solution is

#(0.972)(3.4color(white)(l)"kg") = 3.30# #"kg NaOH"#

The percent by mass in solution is

#%"mass NaOH" = "mass NaOH"/"mass solution"xx100%#

#= (3.30color(white)(l)"kg")/(underbrace(3.4color(white)(l)"kg")_"caustic soda" + underbrace(8.6color(white)(l)"kg")_"water")xx100%#

#= color(red)(32%#

rounded to #2# significant figures.

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