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Hard water often contains dissolved Ca2+ and Mg2+ ions. One way to soften water is to add phosphates. The phosphate ion forms insoluble precipitates with calcium and magnesium ions, removing them from solution. Suppose that a solution is 5.5×10-2 M in calcium chloride and 7.5×10-2 M in magnesium nitrate.
What mass of sodium phosphate would have to be added to 1.5Lof this solution to completely eliminate the hard water ions? Assume complete reaction.
Suppose that you have a 2.0 L sample of hydrogen at 1.00 atm and 59 C. If you heat the sample to 84 C and it expands to a volume of 3.7 L, what will the final pressure be?
before addition of any KOH b) after addition of 25.0 mL of KOH c) after addition of 35.0 mL of KOH d) after addition of 50.0 mL of KOH e) after addition of 60.0 mL of KOH
5. Zinc carbonate, ZnCO3, a slightly soluble substance, is most soluble in which of the following solvents? a) water b) 0.1M ZnCl2 (aq)
The purity of gold alloys is expressed in karats, which is the mass fraction of gold multiplied by 24. Pure gold is 24 kt, whereas 10 kt gold jewelry typically contains 41.666667% gold, 29.166667% silver
You have 4.507 L of a 0.1572 M H3BO3 (boric acid, Ka = 5.800x10-10) solution. To convert this into a buffer having a pH of 9.3380, how many grams of KH2BO3 (M.W. 99.926) should be added to the solution?
The solubility of CaSO4 in pure water at 0.0 C is 1.13 gram per liter; what is the value of solubility product
a 27.00 g sample of an unknown hydrocarbon was burned in excess oxygen to form 88 g of co2 and 27 g of h2o. what is a
What is the reaction order with respect to \rm A. Can the same method be used to find reaction order of B and C
How does one determine the number of stereoisomers and constitutional isomers that are produced in reaction a molecule contains.
Show the derivation for the thee inhibition cases: Competitive , Non-Competitive and Uncompetitive?
for which Kp=2.00 at 20 C. A mixture of NO(g) at a partial pressure of 1.50 atm and NO2(g) at a partial pressure of 0.50 atm is allowed to come to equilibrium in a sealed container maintained at 20 C.
A sample of a material that contains sodium is placed in a thermal neutron beam whose flux is 2.0 × 1018 neutronsm2 . s for 1.00 h. The activity of the sample is then 5.0 µCi. How much sodium was present in the sample? (This is an example of neutr..
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