# Question: Is 70 alcohol by weight or volume?

Contents
Concentration of ethanol by weight (w/w) Concentration of ethanol by volume (v/v)
70.0% (w/w) 77.0% (v/v)
73.5% (w/w) 80.0% (v/v)
75.0% (w/w) 81.3% (v/v)
80.0% (w/w) 85.5% (v/v)

## What does 70% vv mean?

Volume Percent of a Solution. … So, returning to our rubbing alcohol, 70% (v/v) means that for every 100 mL of solution, there are 70 mL of the solute, isopropanol.

## What is the weight of 70% alcohol?

Isopropyl alcohol weighs 0.78509 gram per cubic centimeter or 785.09 kilogram per cubic meter, i.e. density of isopropyl alcohol is equal to 785.09 kg/m³; at 25°C (77°F or 298.15K) at standard atmospheric pressure.

## What does 80% vv mean?

But the percent is often expressed in two ways: If I add 800 mL of ethanol to 200 mL of water the resulting solution is 80% v/v. ( 800 mL in a total volume of 1000 mL)

## Is 99% isopropyl alcohol safe for skin?

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.

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## How do you dilute 95% alcohol to 70?

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.

## What is a 2% solution?

2% w / w solution means grams of solute is dissolved in 100 grams of solution. … 5% v / v solution means 5 ml of solute is dissolved 100 ml of solution.

## What does 2% V V mean?

Mass concentration of solution is expressed as % w/v for weight per volume. It can alternatively be abbreviated to m/v for mass per volume. This is used when a solid chemical is dissolved in a liquid.

## What is the solvent in a 70 alcohol solution?

A 70% alcohol solution contains a high amount of alcohol. Thus, the solvent is alcohol.

## How do you make 50% alcohol to 70%?

If it has to be 70%, take a litre of 100% solution, add 800 mL of 50% solution (400 mL of alcohol), and a further 200 mL of water or whatever you are using to dilute. Now you will have 2 L containing 1400 mL of alcohol–a 70% solution. Otherwise use algebra!

## How do you dilute 91% alcohol to 70?

Measure out one cup of 91 per cent rubbing alcohol, and pour it into the plastic container. Add one-third of a cup of water and stir to mix the solution. The solution is now 70 per cent rubbing alcohol. Repeat this procedure as often as needed to obtain the desired amount of 70 per cent rubbing alcohol.

## Why is ethanol 70%?

All Answers (43) c) An ethanol percentage of 50-80% destroys the cell wall/membrane of bacteria by denaturing their proteins and dissolving their lipids. Effective against most bacteria, fungi and some viruses; ineffective against bacterial spores.

## What does V V mean in hand sanitizer?

Ethanol concentrations can be expressed as percentage by volume (v/v) and percentage by weight (w/w).

## What does 95% v/v alcohol mean?

Forms and strengths

– Alcoholic strength is expressed: • preferably as a percentage by volume of alcohol (% v/v); e.g. 1000 ml of 95% v/v alcohol contains 950 ml of absolute alcohol.

## What means V V?

aqueous solutions: volume/volume percent. Concentration: Volume/Volume % When the solute is a liquid sometimes it is convenient to express its concentration in volume/volume percent (v/v %). The definition of v/v % is. Wine has about 12 mL of alcohol (ethanol) per 100 mL of solution.