A solution contains 95 ml of alcohol in 0.105 L of water . Calculate the volume percentage (v/v)% of the solution . What will be the change in concentration if <br />(i)The solution is diluted with 25 ml water <br />(ii) 5 ml alcohol is added to it , considering the changes to be made under similar temperature and pressure
Answers
Answer:For example, to make 70% ethanol from 95% ethanol, take 70 mL of 95% ethanol and add enough water to bring the volume to 95 mL. You will then have 95 mL of 70% ethanol. This works for any dilution and all that is required is a large enough graduated cylinder.
A percent v/v solution is calculated by the following formula using the milliliter as the base measure of volume (v):
% v/v = mL of solute/100 mL of solution.
Example:
X % = 5.0 mL HCl/100 mL of solution.
X/100 = 5.0/100.
100X = 500.
X = 5.0% % v/v.
All we have to do is to subtract the volume of 95% alcohol from the volume of 75% alcohol, in this case: 1.26 x 1.00 = 0.26 l = 260 ml.
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This means that you have 75% of pure alcohol and 25% of water:
0.75 x 1000 = 750 ml.
This is the amount of pure alcohol.
0.25 x 1000 = 250 ml.
This is the amount of water.
Isopropyl alcohol being miscible with water you can dilute it to 70% . For this pupose take about 70.5 ml. of isopropyl alcohol and dilute it to 100 ml. ... 99% alcohol can easily be diluted by adding water to it.
The only downside of 99% isopropyl alcohol is that, understandably, it needs to be used and stored properly. In this concentration, it is highly flammable, may cause dizziness if used in high quantities in an ill-ventilated area, and can be an irritant to skin and eyes. Of course, it should also never be ingested.
DIY Disinfecting Spray Cleaner
1 1/4 cups water.
1/4 cup white vinegar.
1/4 cup (60% + alcohol content) vodka or Everclear (excellent germ-killing properties – you can substitute rubbing alcohol, but it will have a more medicinal scent)
15 drops essential oil – peppermint + lemon OR lavender + lemon are great in this recipe.
glass spray bottle.
1 cup of 91% isopropyl alcohol.
½ cup of aloe vera gel (natural or store-bought)
15 drops of tea tree oil (or another antibacterial essential oil)
Explanation: mark as brainliest