source : farmwater.org
The solution to pollution is not, in fact, dilution.
While a catchy phrase, scientific and other experts generally agree that the “solution to pollution is dilution” approach leaves much to be desired. Relying on dilution to solve the Delta’s water quality problems is at best wasteful of this precious resource, and at worst destructive to the lives of millions of Californians.
Unlike the State Water Board, California’s environmental and water experts are following the science and looking at the bigger picture question: How do we maintain the health of today’s Delta which has obviously changed since the days of the Gold Rush. Yes, the Delta has been fundamentally altered over the years with the introduction of new species, inevitable population growth and more. But experts note that the Delta as it exists today, may in fact be an ecosystem in balance. Introduced species like bass have adopted specific roles in the ecosystem, while other species have adapted and filled other ecosystem niches as changes to water quality, food webs, and habitat have evolved.
In order to keep today’s Delta healthy, ecosystem experts generally recommend holistic strategies instead of single-tool approaches like flushing the Delta with additional water. These holistic strategies address many factors, like habitat loss, predation, and water quality as delicately balanced parts of an entire working network, instead of simply isolated components.
Californians are being asked to make good water management a way of life. We are being asked to be adaptive and seek flexible, creative approaches to how we use water at home, at our jobs, and on our farms. We are being asked to be reasonable with the water we use, to be good stewards, to avoid waste, and to limit our water use to what is reasonably required.
Californians have risen to those challenges and we should expect no less of California’s State Water Resources Control Board.
Dilutions and Concentrations – Introductory Chemistry – Dilution is the addition of solvent, which decreases the concentration of the solute in the solution. Concentration is the removal of solvent, which increases the concentration of the solute in the solution. (Do not confuse the two uses of the word concentration here!) In both dilution and concentration, the amount of solute stays the same.Which of the following is not true about the dilution of a solution? The concentration decreases. The amount of solute remains constant. The volume decreases. The amount of solvent increases.Serial dilutions involve diluting a stock or standard solution multiple times in a row. Typically, the dilution factor remains constant for each dilution, resulting in an exponential decrease in concentration. For example, a ten-fold serial dilution could result in the following concentrations: 1 M, 0.1 M, 0.01 M, 0.001 M, and so on.
Which of the following is not true about the dilution of a – Which statement about solubility is not true? A) Solubility of ionic solids increases greatly with temperature. B) In a solution containing excess solute, an equilibrium exists between dissolved and undissolved solute. C) No additional solute will dissolve in a saturated solution. D) A supersaturated solution is unstable.The amount of dissolved substance….. Initially, we have a concentration of "Moles of solute"/"Volume of solution". Now dilution, will increase the volume; it will have no effect on the moles of solute present in the initial solution. And thus "concentration of solute" WILL DECREASE…..however, the amount of dissolved substance will remain constant.Multiple choice questions. Try the following multiple choice questions to test your knowledge of this chapter. For each question there is one correct answer. The periodic table, physical constants and relative atomic masses needed for these problems are given on the inside covers of Chemistry, fourth edition by C.E. Housecroft and E.C. Constable.Once you have answered the questions, click on
Dilutions of Solutions | Introduction to Chemistry – Which of the following statements correctly describe the changes occurring during a dilution? Select all that apply. 1. The concentration of the solution increases. 2. The number of moles of solvent will not change. 3. The number of moles of solute will not change. 4. The concentration of the solution decreases. 5.You set up the following dilutions of a 1 mg per ml solution of "compound A", reading the absorbance at 560 nm. Calculate the percentage of dilution of compound A for each dilution and fill in the table Graph concentration vs. absorbance of the above dilutions. Be sure to label all axes.A solvent and a solute with similar attractive forces will easily make a solution. The only true solutions are formed when water dissolves a polar solute. A solvent will dissolve a solute that has a similar mass.