One of the main components of hard water is caco3. when hard water evaporates, some of the caco3 is left behind as a white mineral deposit. plumbing fixtures in homes with hard water often acquire these deposits over time. toilets, for example, may develop these deposits at the water line as the water in the toilet slowly evaporates away. if water is saturated with caco3, how much of it has to evaporate to deposit 0.390 g of caco3? ksp for caco3 = 4.96 x 10-9.

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he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".