Hw10K-G1-Electrolytes

Hw10K-G1-Electrolytes - HW SET 11 KEY ELECTROLYTES...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
HW SET 11 - KEY ELECTROLYTES / ACID-BASE Chemistry 2045 HW11K-G1.ELC (s) (aq) 1. a) NaI ! Na + I +- 2 (s) b) CaBr ! Ca + 2 Br 2+ - c) KCN ! K + CN d) Ba(OH) ! Ba + 2 OH - 2 4 (s) 4 e) K SO ! 2 K + SO +2 - 4 (aq) f) KHSO ! K + HSO 3 3 (s) 3 (aq) g) Al(NO ) ! Al + 3 NO 3+ - Better: 2 6 Al(NO ) ! Al(H O) + 3 NO - 4 h) NH Cl ! NH + Cl 2 3 2 3 2 (aq) i) NaC H O ! Na + C H O 2 2 7 (s) 2 7 j) K Cr O ! 2 K + Cr O - 2 4 3 (s) 2 6 4 k) Fe (SO ) ! 2 Fe(H O) + 3 SO 2- 4 2 (s) 2 6 l) Zn(ClO ) ! Zn(H O) + 2 ClO - 3 (s) 2. a) AgNO ! Ag + NO b) KCl ! K + Cl 2 3 KCO ! 2 K + CO - KMnO ! K + MnO 3 2 (s) c) Pb(NO ) ! Pb + 2 NO - 2 4 d) Na SO ! 2 Na + SO - NaClO ! Na + ClO 2 3 2 3 NaC H O ! Na + C H O e) KBr ! K + Br 2 6 AlBr ! Al(H O) + 3 Br - f) NaOH ! Na + OH Ba(OH) ! Ba + 2 OH - 2 g) Na S ! 2 Na + S - 4 2 (NH ) S ! 2 NH + S - 2 4 h) K CrO ! 2 K + CrO -
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 2 (aq) (aq) 3. a) CuI = Cu + 2 I 2+ - Half-reactions: Cathode (reduction): Cu + 2e ! Cu - 2 Anode (oxidation): 2 I ! I + 2e -- 2 Overall Reaction: Cu + ! Cu + I - 23 ( R ) ( R ( R ) b) Fe O = 2 Fe + 3 O 3+ 2- Half-reactions: Cathode (reduction): Fe + 3e ! Fe - 2 Anode (oxidation): 2 O ! O + 4e - Since the number of electrons lost must equal the number of electrons gained. .. 4( Fe + ! Fe ) - 2 3( 2 O ! + 4e ) - Overall Reaction: 2 4 Fe + 6 O ! 4 Fe + 3 O 2 4. a) 0.20 M CaCl = Ca + 2 Cl - 0.20 M 0.40 M 3 3 2 6 3 (aq) b) 0.15 M Fe(NO ) = Fe(H O) + 3 NO - 0.15 M 0.45 M 2 4 3 2 6 4 c) 0.10 M Al (SO ) = 2 Al(H O) + 3 SO 0.20 M 0.30 M Electrical conductivity is a function of the total concentration of all ions in solution. The sum of the ion concentrations in (a) or (b) equals 0.60 M which exceeds the total ion concentration of 0.50 M in (c). Solutions (a) and (b) should therefore have about the same ability to conduct and both would be better conductors than solution (c). 5. Pure water (distilled) is a very poor conductor of electricity since it is almost entirely molecular in nature. Tap water, however, often contains dissolved "minerals" which in fact usually turn out to be ionic in character. These ions are responsible for the potential hazard of electrical shock. 6. The symbol ! is usually used to indicate the complete chemical transformation of reactants to products ( R ! P ). If the products have a significant tendency to react and reform the original reactants, a condition may be reached in which the rate of formation of the products equals the rate of formation of the reactants, and a state of dynamic chemical equilibrium is achieved. This is indicated by the opposing arrows, , in the chemical equation (R P). When equilibrium is attained, the relative proportions of reactants to products remains constant unless the system is disturbed.
Background image of page 2
3 22 4 3 2 3 2 7. a) Br b) OH c) H O d) H PO e) CO f) C H O g) OCl -- - 2 - - - 43 2 5 3 h) HPO i) O j) NH k) Fe(H O) (OH) l) CH O m) OH 2- 2+ - - 23 4 2 2 2 2 4 8. a) H O b) H O c) HCl d) HPO e) NH f) HNO g) H C O +2 - - 24 h) H i) HS j) NH -+ 9. a) The stronger the acid, the weaker the conjugate base. If HCl is a stronger acid than HF, then the conjugate base of HF, that is F , would be a stronger base than Cl .
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/16/2011 for the course CHM 2045 taught by Professor Mitchell during the Fall '07 term at University of Florida.

Page1 / 8

Hw10K-G1-Electrolytes - HW SET 11 KEY ELECTROLYTES...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online