Asian Posted March 11, 2007 Posted March 11, 2007 Can someone please explain to me how to do this problem. The molarity and molality of potassium chloride solution are 1.000 mol/L and 0.9750 mol/kg. what is the solutions density? I got an answer of 1.101 g/ml. will someone show me how to do it and verify to see if my answers right?
hotcommodity Posted March 11, 2007 Posted March 11, 2007 I dont see any problem... Edit: When I worked the problem, I got 1.026 g/ml. I simply canceled out terms to find the density... (1.00 mol KCl/ 1L) * ( 1 kg / 0.9750 mol KCl) * (1000 g/ 1 kg) * ( 1L / 1000 ml) = 1.026 g/ml Are you sure there wasn't more to the problem?
Borek Posted March 12, 2007 Posted March 12, 2007 You must find out how to convert molarity to molality. Correct conversion formula will contain density and molar mass - you have to solve for density. Check out these concentration lectures for hints on converting (read about %ww to molarity conversions for general outline). Strange thing is that 1.0000M solution of KCl is 1.0312 molal. Looks like the data in question are questionable. Borek -- Chemical calculators at www.chembuddy.com concentration conversion calculator
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