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Nick DiGregorio is developing film in his darkroom when he realizes he does not have the proper developer. He needs a mixture that is 20% developer, but he only has a mixture that is 70% developer. How much pure water must be mixed with 9 pints of 70% developer to produce the mixture he needs? Round your answer to the nearest hundredth when necessary.

the standard diluton equation applies here.

C1V1 = C2V2

C1 is 70%, V1 is 9 pints, C2 is 20%

The total final volume, V2 = C1V1/C2

The total amount of water to be added is V2 - V1

2008-05-14 11:07:23 by Lola18

Clean burning renewable energy is here with hydrogen fuel cell solar combination. Please read the original blog post in which this appeared for ...

It also lists Potassium Bicarbonate. Why do they call it pure water? Isn't that false advertising?

Exactly............our lives have become so complicated that even water aint water anymore

2009-07-18 11:51:03 by John

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This is for a science (specifically Chemistry) lab we were doing. Our teacher brought out a beaker with a muddy mix of water and dirt, telling us to try and seperate the dirt from water and produce as much pure water as possible. We have access to all the equipment at school, like the bunsen burners, beakers and such. He instructed us to create an original way to filter out the dirt. We are allowed to bring materials or supplies from home, although he suggested not to bring coffee filters as that isn't very original... and I have been brainstorming with no conclusions. Any suggestions or cool ideas?

Make a water still. Separate the pure water from the dirt through distillation, either by evaporation (slow) or by heating it to boiling (fast). Have the pure water vapor condense and drip into a clean unsealed flask.

Seal your flask of muddy water with a stopper with a hole in it. Attach tubing to the flask through the stopper. Arrange the tubing so that it goes to a much higher level (try at least 1 foot), then loosely coil it downward and have the open end inside a clean empty flask that is not sealed (you don't want to build up pressure that might explode the flasks, so make sure the tubing is not kinked and the flask is open to air.) Heat the muddy water over a bunsen burner to boiling. The water vapor that escapes will travel up through your tubing and when cooled by the lower temperature of the air around the coiled tubing, it will condense back into water and drip into your clean flask, giving you fairly pure water.

2007-05-15 14:47:35 by j_moonie

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If a drink calls for pure water, can you substitute it with boiled water instead? Cause I'm trying to de-tox but I'm not sure if there will be any consequences. ;x This question sounds stupid lol.

So, is there ANY difference between pure water and boiled water?

yes, pure water is distiled. which means it goes through a process just like booze. it gets boiled in a vessel and the vapors are condensed through a series of tubing that is cooler then the surrounding air. this results in the water vapor turning back to liquid, you now have purified water, or pure water.

2007-08-30 08:32:32 by Holls

For example, a barrell with a density of 1.0, and one cubic foot of air in it, how much force can be applied on it before it sinks, assuming its placed in pure water?

There are a number of forces to keep track of:
1. the weight of the barrel
2. the weight of a cubic foot of air
3. the weight of water displaced by the barrel
4. the weight of water displaced by the cubic foot of air

The weight of water displaced will equal the amount of force resisting the submersion of the barrel.

Since the barrel conveniently has a density of 1.0 (equal to pure water), we can ignore it completely (its downward weight balances the upward displacement force)

To submerge the barrel, the downward force and the downward weight of air must equal the upward force generated by the displaced water. Since the air density is not mentioned, and water is over 800 times as dense as air at normal sea level pressure, we can ignore the weight of air for a first order approximation.

Downward force = weight of water = (volume of water) x (density)

Pure water has a density of 1.0, or 62.42 lb/cu.ft

Downward force required is ~ 62.42 lbs. For a more accurate result, feel free to include the slight effect of the air (about .07 lbs)

2008-04-21 15:48:32 by dukes