A solution of sodium chloride in water is saturated at a temperature of 15 °c. Calculate the weight of nacl that can be dissolved by 100 kg of this solution if it is heated to 65 °c.
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A solution is prepared by dissolving 15g of sodium chloride in 200g of water. What is the mass percentage of salt in this solution?
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Bruce Heath, BAS-App Chem Chemistry & Chemical Formulations, Queensland Institute of Technology (1982)
Answered May 18
You’re looking for % w/w, so :
Total weight of solution = weight of solute + weight of solvent : (15 + 200)g = 215g
Weight of solute = 15g
So, %w/w = 15/215 = 6.976% or approx 7% w/w
If you were doing % w/v :
Assuming the addition of salt DOES NOT INCREASE SOLUTION VOLUME :
15g/200ml = 7.5% w/v
But this doesn’t hold true, as adding salt to water will increase the volume, but not by 1ml for 1g (more like 1ml for every 2g)
If you were doing this properly :
15g made up to 200ml with water = 7.5% w/v
15g mixed with 200ml of water will be slightly less %w/v, as the total volume will be slightly more than 200ml, so probably more like 7.2 %w/v.....
Hope this helps. All the best.
Thank you
Your friend
Shanayaa Singh Rajput
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Have you ever had a neighbor who is far from normal?
He was obsessed with my mom. It was innocent at first, but then it started to get really creepy.
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8 ANSWERS

Bruce Heath, BAS-App Chem Chemistry & Chemical Formulations, Queensland Institute of Technology (1982)
Answered May 18
You’re looking for % w/w, so :
Total weight of solution = weight of solute + weight of solvent : (15 + 200)g = 215g
Weight of solute = 15g
So, %w/w = 15/215 = 6.976% or approx 7% w/w
If you were doing % w/v :
Assuming the addition of salt DOES NOT INCREASE SOLUTION VOLUME :
15g/200ml = 7.5% w/v
But this doesn’t hold true, as adding salt to water will increase the volume, but not by 1ml for 1g (more like 1ml for every 2g)
If you were doing this properly :
15g made up to 200ml with water = 7.5% w/v
15g mixed with 200ml of water will be slightly less %w/v, as the total volume will be slightly more than 200ml, so probably more like 7.2 %w/v.....
Hope this helps. All the best.
Thank you
Your friend
Shanayaa Singh Rajput
Please mark as Brainliest and please follow me...I will surely help u
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