How many grams of Na_{2}SO_{4} should be added
to 228 g of water to make a solution with a colligative molality of
0.530 m?
(Please see Your Turn #3-3, lecture 3, slide 22 for
assistance.)
____g
Na2SO4 is a strong salt : Na2SO4 = 2 Na+ + SO42- for which i =
Vant'Hoff factor = 2 + 1 = 3
0.530 = moles ions/ 0.228 Kg
moles ions =0.530×0.228=0.1208
moles Na2SO4 = 0.1208/3=0.0402
mass Na2SO4 = 0.0402 x 142 g/mol=5.708 g
Thank you
How many grams of Na2SO4 should be added to 228 g of water to make a...
How many grams of water should be added to 1.75 grams of fructose to give a 0.126 molal solution? (MW of fructose = 180.16 g/mol)
How many grams of magnesium sulfate should be added to 425 mL of de-ionized water to make a 0.075 M solution?
How many grams of MgCl2 (molar mass = 95.2 g/mol) should be added to 300 grams of water to give a solution that freezes at -3.00°C? Kf of H2O is 1.86°C/m.
How many grams of NaCl would need to be added to 4001 g of water to increase the boiling temperature of the solution by 1.500 °C? (Kb for water is 0.5100 °C/m)?
17) How many grams of water are in 250.0 g of a 5% by mass solution? How many grams of sugar are in this solution? 18) A solution is prepared with 45.0 g of NaCl in enough water to make a 50mL solution. What is the molarity of the solution? 19) If 345 g of MgCl, solution is evaporated and 32.8 g of magnesium chloride are collected. What is the mass percent of the salt in the solution? How much...
How many grams of CaCl2 are needed to make 5926 g of a solution that is 28.0% (m/m) calcium chloride in water? Note that mass is not technically the same thing as weight, but % (m/m) has the same meaning as % (w/w). Number g CaCl How many grams of water are needed to make this solution? Number g H20
How many grams of CaCl, are needed to make 974.0 g of a solution that is 37.0% (m/m) CaCl, in water? Note that mass is not technically the same thing as weight, but % (m/m) has the same meaning as % (w/w). grams CaCl2 = How many grams of water are needed to make this solution? grams H,O=
How many grams of CaCl, are needed to make 741.8 g of a solution that is 38.0% (m/m) CaCl, in water? Note that mass is not technically the same thing as weight, but % (m/m) has the same meaning as % (w/w). grams CaCl, = How many grams of water are needed to make this solution? grams H,0 =
PART A How many grams of ethanol, CH3CH2OH, should you dissolve in water to make 0.400 L of vodka (which is an aqueous solution that is 6.86 M ethanol)? Express your answer with the appropriate units. PART B Using the density of ethanol (0.789 g/mL), calculate the volume of ethanol you need to make 0.400 L of vodka. Express your answer with the appropriate units.
How many grams of solid ammonium chloride should be added to 1.00 L of a 0.281 M ammonia solution to prepare a buffer with a pH of 8.530 ? grams ammonium chloride = g. How many grams of solid sodium acetate should be added to 0.500 L of a 9.49x10-2 M acetic acid solution to prepare a buffer with a pH of 5.309? grams sodium acetate =