Chemical Principles in the Laboratory
Chemical Principles in the Laboratory
11th Edition
ISBN: 9781305264434
Author: Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher: Brooks Cole
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Chapter 12, Problem 3ASA

You are given a colorless unknown solution that contains one of the following salts: NaA , NaB , NaC . In solution, each salt dissociates completely into the Na + ion and the anion A , B , or C , whose properties are given in Problem 2. The Na + ion is effectively inert. Given the availability of solutions of A 2 , B 2 , and C 2 , develop a simple procedure for identifying the salt that is present in your unknown.

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A town's water supply has been determined to have excessive fluoride ion concentration. You need to remove the fluoride ions from the water. Of the following salts, which salt would be the most effective at removing the fluoride? Ba(OH)2, CdCO3, Ca3(PO4)2, Pb(HCO3)2, MgI2 Ksp(BaF2)=1.84x10^-7 Ksp(CdF2)=6.44x10^-3 Ksp(CaF2)=3.45x10^-11 Ksp(PbF2)=3.3x10^-8 Ksp(MgF2)=5.16x10^-11
A 30.0 mL aliquot of 0.300 M H_3 PO_4 is mixed with 90.0 mL of 0.200 M KOH, and the mixture is evaporated. Will the salt that crystallizes out be K_3 PO_4, K_2 HPO_4, or KH_2 PO_4? Show your calculations by using an ICE table (or two or three). H_3 PO_4(aq) + KOH_(aq) rightarrow KH_2 PO_4(aq) + H_2 O (l) The next proton on the H_2 PO_4^- would start to react only when more OH^- was added, over and above the first mole: KH_2 PO_4(aq) + KOH_(aq) rightarrow K_2 HPO_4(aq) + H_2 O (I) The final proton on the HPO_4^2- would start to react only when more OH^- was added, over and above the second mole: K_2 HPO_4(aq) + KOH_(aq) rightarrow K_3 PO_4(aq) + H_2 O (I)
Limestone consists mainly of the mineral calcite, CaCO 3. The carbonate content of 0.5413 g of powdered limestone was measured by suspending the powder in water, adding 10.00 mL of 1.396 M HCl, and heating to dissolve the solid and expel CO 2: CaCO 3(s) + 2 HCl → CaCl 2 + CO 2(g) + H 2O The excess acid required 39.96 mL of 0.1004 M NaOH for complete titration to a phenolphthalein end point. Find the weight percent of calcite in the limestone.
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