Question

A solution of KOH in water has a molarity of 7.0 and a KOH content of 30.21% (weight). What is the density of the solution?​

Answer 1

Answer:

The molar mass of KOH is 56.1 g/mol.

6.90 M KOH solution corresponds to 6.90 moles ( or

6.90×56.1=387.09 g) of KOH in 1 L of solution.

The solution contains 30% by mass of KOH.

Thus, the mass of the solution is 387.09×

30

100

=1288 g.

The density of the solution is

Volume

Mass

=

1000

1288

=1.288 g/mL.

So, the correct option is C.