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Water softeners often replace calcium ions in hard water with sodium ions. Since sodium compounds are soluble, the presence of sodium ions in water does not cause the white, scaly residues caused by calcium ions. However, calcium is more beneficial to human health than sodium because calcium is a necessary part of the human diet, while high levels of sodium intake are linked to increases in blood pressure. The U.S. Food and Drug Administration (FDA) recommends that adults ingest less than 2.4 of sodium per day.
How many liters of softened water, containing a sodium concentration of 4.7×10-2 % sodium by mass, have to be consumed to exceed the FDA recommendation? (Assume a water density of 1.0 g/ml.)
Metallic aluminum reacts with MnO2 at elevated temperatures to form manganese metal and aluminum oxide. A mixture of the two reactants is 67.2% mole percent Aluminum. Find the theoretical yield(in grams) of manganese from the reaction of 270 grams..
Why does this calculation only provide an estimate of the NaOH concentration. In other words, why do we have to standardize the HaOH in this experiment to find its exact concentration
A reaction that is spontaneous can be described as a releasing heat to the surroundings. b. increasing in disorder. c.proceeding in both the forward and reverse directions.
Why is it particularly important to wash the cupric hydroxide intermediate in the synthesis of cupric acetate (verdigris)? Be specific about what is being removed and why it matters.
what will be the final concentration of the seawater at 20 °C when reverse osmosis stops? Assuming that seawater has a total ion concentration (a.k.a colligative molarity) of 1.10 Mc, calculate how many liters of seawater are needed to produce 15...
Calculate the molality of a solution containing 292g glucose(C6H12O6) dissolved in 1.91L of water.
For the following reaction, 5.07 grams of carbon disulfide are mixed with excess chlorine gas. The reaction yields 9.09 grams of carbon tetrachloride.
Calculate the equilibrium pressure of CO2 due to the decomposition of barium carbonate (BaCO3) at 25°C. In atm.
In a particular redox reaction, Cr is oxidized to CrO42 and Ag is reduced to Ag. Complete and balance the equation for this reaction in acidic solution. Phases are optional.
A sample of nitrogen gas was collected over water at 20 degrees celsius and a total pressure of 1.00 atm. A total volume of 2.50 x 10^1 mL was collected. What mass of nitrogen was collected
Chlorine dioxide gas is used as a commercial bleaching agent. One method of preparing ClO2 is the reactiong of chlorine gas with sodium chlorite as:
you have 505ml of a .170m HCL solution and you want to dilute it to exactly .100M. how much water should you add?
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