Answer to Question #147748 in General Chemistry for enis

Question

What is the quantitative concentration and molar concentration of KOH solution with d = 1.37g / cm3
and mass participation 36, 90%. Mr (KOH) = 56.11g mol-1.

Answer 1

Quantitative Concentration means mass percentage. which is given i.e. 36.90% .

Molar concentration is Molarity of the solution.

formula for calculating molarity from given density of solution is $= \frac {w*d*10}{M(solute)}$

where,

w is mass percent of solute

d is density of solution in g/mL

M is molar mass of solute.

Therefore,

Molarity =$\frac{36.9*1.37*10}{56.11}$

= 9.01 M