J John New member Aug 1, 2009 #1 Calculate the mass percent, % (m/m), for the solute in each of the following solutions A) 75g of NaOH in 325 g of NaOH solution B) 2.0g of KOH in 20.0g of H2O
Calculate the mass percent, % (m/m), for the solute in each of the following solutions A) 75g of NaOH in 325 g of NaOH solution B) 2.0g of KOH in 20.0g of H2O
D Dr.A New member Aug 1, 2009 #2 % by mass = mass solute x 100 / mass solution A) mass solution = 75 + 325=400 g % = 75 x 100/400=18.8 B) mass solution = 2.0 + 20.0 = 22.0 g % = 2.0 x 100/ 22.0=9.1
% by mass = mass solute x 100 / mass solution A) mass solution = 75 + 325=400 g % = 75 x 100/400=18.8 B) mass solution = 2.0 + 20.0 = 22.0 g % = 2.0 x 100/ 22.0=9.1
N niko New member Aug 1, 2009 #3 Formula: (Mass of solute/mass of solvent) x 100 A) (75/325) x 100 = 23% (with sig-figs) B) (2.0/20.0) x 100 = 10.% (with sig-figs)
Formula: (Mass of solute/mass of solvent) x 100 A) (75/325) x 100 = 23% (with sig-figs) B) (2.0/20.0) x 100 = 10.% (with sig-figs)
