Question

2 SHOW ALL WORK STEP BY STEP WITHOUT SHORT CUTS

1) make a solution of 0.25% n-propanol (use 10 ml volumetric flask)

2) make a water solution of methanol and isopropanol of 0.2% make it in the same container and in separated container.

3) make a 50ml stock solution of 0.50 wt% ethanol .

4) make five solution ranging from of ethanol 0.0 %, 0.05%, 0.10%, 0.20,% 0.30% 0.40% 0.50% wt% in water. (Used 10ml volumetric flasks)

Answer 1

1) for the 0.25% n-propanol solution

• take 0.025ml of n-propanol.
• dissolve this 9.975ml of water

2) 0.2% isopropanol in water solution

• take 0.02 ml of isopropanol
• dissolve this in 9.98ml water

3) 0.5wt% ethanol

• take 0.25ml ethanol
• dissolve in 49.75ml water

4) for 0.0% - take full 10ml ethanol

• 0.05% - 0.005ml ethanol and rest water
• 0.1% - 0.01ml ethanol and rest water
• 0.2% - 0.02ml ethanol and rest water
• 0.3% - 0.03ml ethaol and rest water
• 0.4% - 0.04ml ethaol and rest water
• 0.5% -0.05ml ethaol and rest water