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Hard water at home contains dissolved ions (ex. Ca2+ & Mg2+) that react with soap to form a nasty gray substance. Because this gray stuff would ruin your clothes, most laundry detergents add ingredients that combine with the Ca2+ and Mg2+ ions to form insoluble precipitates that are easily washed away with the dirty water. a.) NaCl b.) Na2CO3 c.) NaNO3 d.) KI e.) Pb(OH)2 i got b but is that right?
when aluminum is heated in oxygen, aluminum oxide is formed. What weight of the oxide can be obtained from 25.0 g of the metal.
A stock solution is prepared by adding 20 mL of 1.21 M AlCl3 to enough water to make 72 mL. What is the Al3+ concentration of 30 mL of the stock solution
2Na + 2H2O → + H2 How many moles of hydrogen gas are produced when 0.066 mole of sodium is completely reacted?
If we add a solid aluminum cylinder to a graduated cylinder containing 19.2 mL of water, and the water level in the cylinder rises to 24.7 mL, what is the mass of the aluminum cylinder?
Chemistry The rate of a first-order reaction is followed by spectroscopy, monitoring the absorption of a colored reactant at 520 nm. The reaction occurs in a 1.09-cm sample cell
The standard molar heat of vaporization for water is 40.79 kJ/mol. How much energy would be required to vaporize 29.0 g of water?Answer in units of kJ.
A compound made up of only phosphorus and chlorine contains 77.45% chlorine by weight. What is the electron domain geometry of the central atom of this substance?
Calculate percent recovery of panacetin from the individual masses of its mictures, sucrose (.044g), aspirine (.093), and the unknown (.339).
Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more complicated, but this is a reasonable first approximation.)
How many milliliters of 0.200 M NaOH will be required to titrate 19.6 mL of 0.479 M H2SO4
What is the osmotic pressure of a solution that contains 4.26 ×10-3 moles of lactose in 111 mL of solution at 29C?
A 15.00 mL sample of unknown concentration of sulfuric acid is precititated with excess lead(II) nitrate and a precipitate of lead(II) sulfate is collected.
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