Do you think alcohol would be just as good, better, or worse than water at dissolving salt? Be sure students identify variables such as: Amount of water and alcohol used Amount of salt added to each liquid Temperature of each liquid Amount of stirring Question to Investigate Is alcohol just as good, better, or worse than water at dissolving salt? Place 15 mL of water and alcohol into separate cups.
At the same time, add the water and alcohol to the samples of salt. Swirl both cups the same way for about 20 seconds and check for the amount of salt dissolved.
Swirl for another 20 seconds and check. Swirl for the last 20 seconds and check. Carefully pour off the water and alcohol from the cups and compare the amount of undissolved salt left in each cup. Expected Results There will be less undissolved salt in the cup with the water than the alcohol. Explain Discuss how differences in the polarity of alcohol and water explain why water dissolves salt better than alcohol. Ask students: Is alcohol just as good, better, or worse than water at dissolving salt?
Alcohol does not dissolve salt as well as water does. How do you know? There was more salt left behind in the cup with the alcohol. Think about the polarity of water and alcohol to explain why water dissolves more salt than alcohol. Have students look at the models of water and alcohol molecules on their activity sheet. Extend Have students compare the solubility of two different ionic substances in water.
Ask students: How could you compare the solubility of calcium chloride and calcium carbonate? Students should suggest measuring equal amounts of each substance and adding equal amounts of water at the same temperature.
Question to Investigate Do all ionic substances dissolve in water? Measure 2 g each of sodium carbonate and calcium carbonate and put them in their labeled cups. Measure 15 mL of water into each of two empty cups. At the same time, pour the water into the sodium carbonate and calcium carbonate cups. Gently swirl both cups. Expected Results The sodium carbonate will dissolve, but the calcium carbonate will not. Discuss student observations. Ask students: Do all ionic substances dissolve in water?
Because calcium carbonate does not dissolve in water, students should realize that not all ionic substances dissolve in water. That is why the danger of electrocution in sea water is less than it would be in bathwater. Lucky for hydrologists here at the USGS, water flowing in streams contains extensive amounts of dissolved salts. Otherwise, these two USGS hydrologists might be out of a job. Many water studies include investigating the fish that live in streams, and one way to collect fish for scientific study is to shoot an electrical current through the water to shock the fish "zap 'em and bag 'em".
Want to know more about conductivity and water? Follow me to the Chloride, Salinity, and Dissolved Solids website! Looking at water, you might think that it's the most simple thing around. Pure water is practically colorless, odorless, and tasteless. But it's not at all simple and plain and it is vital for all life on Earth. Where there is water there is life, and where water is scarce, life has to struggle or just "throw in the towel. We need to take the statement "Water is the universal solvent" with a grain of salt pun intended.
Of course it cannot dissolve everything, but it does dissolve more substances than any other liquid, so the term fits pretty well. Water's solvent properties affect all life on Earth, so water is universally important to all of us. Skip to main content. Search Search. Summary and Key Messages: These re-analyses allow us to draw the following conclusions: 1 In a steady state situation, the urine volume and thus the fluid intake remains unchanged over a large range of sodium intakes.
The adaptation to a higher sodium excretion rests only on changes in urinary sodium concentration. However, above a certain limit, this concentration cannot increase further and the urine volume may then increase.
This is exactly what I've been wanting to know! Thank you for this share I appreciate it. Your article and findings are very helpful, referring to dehydration. It upsets our stomachs. We are in our sixties and in very good health — well, better health now that we drink about 2 liters plus of water each day.
It has made so much difference to our digestive systems and recovery every day. Thank you for your website and effort. No statements made, inferences, including videos and links to other sites, should be construed as a claim for cure, treatment, or prevention of any disease or as a substitute for professional health care. Copyright WaterBenefitsHealth. All rights reserved. Refined table salt is unhealthy. What other visitors have said: This comment forum is no longer active.
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