Q:

http://www.ehow.com/facts_6925741_density-carbonated-water.html

What's the density of carbonated water? see also http://answers.yahoo.com/question/index?qid=20070108143249AA74xzY They say that you can calculate the density of carbonated water (say 1% CO2)by taking a weighted average of the density, 99% the density of water and 1 % the density of CO2 gas.

- Mike W

What's the density of carbonated water? see also http://answers.yahoo.com/question/index?qid=20070108143249AA74xzY They say that you can calculate the density of carbonated water (say 1% CO2)by taking a weighted average of the density, 99% the density of water and 1 % the density of CO2 gas.

- Mike W

A:

Both sites say, in very similar words, that the way to calculate the density of water with 1% carbonation (by molecular concentration, it seems) is to take the weighted average:

0.99*density of water +0.01*density of CO_{2} gas.

They get that dissolved CO_{2} reduces the density by almost 1%, since the density of CO_{2} gas is very low compared to water at atmospheric pressure.

It's a comical example of two bad habits:

1. copying other web sites thoughtlessly.

2. using formulas thoughtlessly.

They aren't even remotely close to getting the description right. The dissolved CO_{2} isn't there as a bunch of little pockets of CO_{2} gas. It's there as individual molecules and ions (some ionizes). Since CO_{2} has a molecular weight about 2.5 times as big as H_{2}O, but doesn't occupy all that much more space, it actually raises the density, rather than lowering it. From looking up the experimentally observed partial molar volume of CO_{2} in water, I get that instead of the density going down almost 1% for every 1% carbonation, it actually goes up about 0.37%.

Mike W.

0.99*density of water +0.01*density of CO

They get that dissolved CO

It's a comical example of two bad habits:

1. copying other web sites thoughtlessly.

2. using formulas thoughtlessly.

They aren't even remotely close to getting the description right. The dissolved CO

Mike W.

*(published on 04/15/2011)*