1) A solution contains 3.5g of potassium hydroxide in 250cm3. Calculate its molarity. [K=39.0, O=16.0, H=1.0]
Step IV
0.0625 moles KOH are in 250cm Q moles in KOH are in 1000cm
Step V
solve for q
   
Q= X 0.0625
   
     
=moles
:. Molarity is in moles per litre
Molarity =moles per litre