What is the weight/ weight% of a solution made by dissolving 12.0g of NaC1 in 100.0 g of water?
% w/w means mass solute/100 g soln.
mass solute = 12.0 g NaCl.
mass solvent = 100 g
mass solution = 100g + 12g = 112g.
%w/w NaCl = (12.0/112)*100 = ?
To find the weight percent of a solution, we need to divide the weight of the solute (NaCl) by the weight of the solution (NaCl + water), and then multiply by 100 to express it as a percentage.
1. Calculate the weight of the solute (NaCl):
Weight of NaCl = 12.0 g
2. Calculate the weight of the solution (NaCl + water):
Weight of NaCl = 12.0 g
Weight of water = 100.0 g
Total weight of the solution = Weight of NaCl + Weight of water
Total weight of the solution = 12.0 g + 100.0 g = 112.0 g
3. Calculate the weight percent:
Weight percent = (Weight of NaCl / Total weight of the solution) × 100
Weight percent = (12.0 g / 112.0 g) × 100
Weight percent ≈ 10.71%
Therefore, the weight percent of the solution is approximately 10.71%.
To find the weight/weight percent of a solution, you need to calculate the ratio of the weight of the solute (in this case, NaCl) to the weight of the solution itself. In this case, the weight of the solution is the sum of the weight of the solute (NaCl) and the weight of the solvent (water).
First, calculate the weight of the solution:
Weight of solution = weight of solute + weight of solvent
Weight of solution = 12.0 g (NaCl) + 100.0 g (water)
Weight of solution = 112.0 g
Next, determine the weight percent of the solute in the solution:
Weight percent = (Weight of solute / Weight of solution) x 100
Weight percent NaCl = (12.0 g / 112.0 g) x 100
Weight percent NaCl = 10.71%
Therefore, the weight percent of the solution made by dissolving 12.0 g of NaCl in 100.0 g of water is 10.71%.